Republicans have taken control of the U.S. Senate and are fighting to keep their majority in the U.S. House, which would produce a full sweep of GOP power in Congress alongside President-elect Donald Trump in the White House.

A unified Republican grip on Washington would set the course for Trump’s agenda. Or if Democrats wrest control of the House, it would provide an almost certain backstop, with veto power over the White House.

Trump, speaking early Wednesday at his election night party in Florida, said the results delivered an “unprecedented and powerful mandate” for Republicans.

He called the Senate rout “incredible.” And he praised House Speaker Mike Johnson, who dashed from his own party in Louisiana to join Trump. “He’s doing a terrific job,” Trump said.

From the U.S. Capitol, Senate GOP Leader Mitch McConnell, privately a harsh Trump critic, called it a “hell of a good day.”

Vote counting in some races could go on for days, and control of the House is too early to call.

The rally for Republicans started early on election night in West Virginia, when Jim Justice, the state’s wealthy governor, flipped the seat held by retiring Sen. Joe Manchin. From there, the Republicans marched alongside Trump across the Senate map.

Republicans toppled Democrat Sen. Sherrod Brown in Ohio, the first incumbent senator to fall, with GOP luxury car dealer and blockchain entrepreneur Bernie Moreno. They chased Democrats in the “blue wall” states of Pennsylvania, Michigan and Wisconsin, where Vice President Kamala Harris strained to carry the party forward, though Democrats avoided a total wipeout as Elissa Slotkin won an open Senate seat in Michigan and Sen. Tammy Baldwin was reelected in Wisconsin.

Democratic efforts to oust firebrand Republicans Ted Cruz of Texas and Rick Scott of Florida collapsed. The unexpected battleground of Nebraska pushed Republicans over the top. Incumbent GOP Sen. Deb Fischer brushed back a surprisingly strong challenge from independent newcomer Dan Osborn.

In one of the most-watched Senate races, in Montana, Democrat Jon Tester, a popular three-term senator and “dirt farmer” in the fight of his political career, lost to Trump-backed Tim Sheehy, a wealthy former Navy SEAL, who made derogatory comments about Native Americans, a key Western state constituency.

All told, Senate Republicans have a chance to scoop up a few more seats, potentially delivering their most robust majority in years — a coda to outgoing GOP Leader McConnell, who made a career charting a path to power, this time by recruiting high-wealth Republicans aligned with Trump.

He told reporters at a Capitol news conference that a Senate under Republican control would “control the guardrails” and prevent changes in Senate rules that would end the filibuster.

McConnell declined to answer questions about his past stark criticism of Trump or about the prospects of potential nominees in a new administration. He also said he viewed the election results as a referendum on the Biden administration.

“People were just not happy with this administration and the Democratic nominee was a part of it,” McConnell said.  Ohio Republicans have tightened their grip on the Ohio Supreme Court from 4-3 to 6-1 by ousting two incumbent Democratic justices and winning a third, open seat, the Associated Press projects based on unofficial results. Results remain unofficial until they are certified by local county boards of elections and the Ohio Secretary of State.

The Ohio Supreme Court will rule on a variety of issues that affect the daily lives of Ohioans ranging from education and environmental issues to gerrymandering and elections to civil and reproductive rights.

The state’s highest court has been under Republican control since 1986 and Republicans currently have a 4-3 majority that will increase to 6-1 starting in 2025.

Republican Hamilton County Court of Common Pleas Judge Megan Shanahan defeated incumbent Democratic Justice Michael P. Donnelly, according to unofficial results.

“I’m honored and grateful to the millions of Ohioans who have put their trust in me to be their Ohio Supreme Court Justice,” Shanahan posted on her campaign Facebook page. “I’ll be true to what I campaigned on and will be a Supreme Court Justice who knows that my job is to interpret the law, not to make it. I’ll go to work each day and focus on protecting Ohio’s citizens, communities, and constitution.”

Incumbent Republican Justice Joseph Deters defeated incumbent Democratic Justice Melody Stewart — ousting her from the court, unofficial results show.

Deters decided not to run for his current seat and won a full six-year term. Ohio Gov. Mike DeWine appointed Deters, a former prosecutor, to a vacant seat in January 2023, even though he had no prior experience as a judge.

In the race for an open seat, Republican Judge Dan Hawkins defeated Democratic Judge Lisa Forbes, the AP projected.

This race was for Deters’ open seat, a term that expires on Dec. 31, 2026. Hawkins currently serves on the Franklin County Court of Common Pleas and Forbes is on the 8th District Court of Appeals. Hawkins will face reelection for a full six-year term in 2026.

In 2021, Republican state lawmakers added party labels to the Ohio Supreme Court races, which were previously nonpartisan.

Democratic Justice Jennifer Brunner’s seat will be up in 2026. The seats of Republican Chief Justice Sharon Kennedy, Republican Justice Pat DeWine, and Republican Justice Pat Fischer will be up in 2028.  The fight for control of the House became a state-by-state slog, much of which unfolded far from the presidential race.

House races are focused in New York and California, where Democrats are trying to claw back some of the 10 or so seats where Republicans have made surprising gains in recent years.

Other House races are scattered around the country, with some of the most contentious in Maine, the “blue dot” around Omaha, Nebraska, and in Alaska.

Democratic House Minority Leader Hakeem Jeffries said the House “remains very much in play.”

To gain control of the House, Democrats need to flip four seats from Republicans, while holding all of their own, a tall task especially in congressional districts where Trump has won.

George Santos, the former New York congressman who spun lies into a brief political career, pleaded guilty Monday to wire fraud and aggravated identity theft, acknowledging that he allowed his ambitions to cloud his judgment.

Santos, 36, is likely to spend at least six years in prison and owes hundreds of thousands of dollars in restitution. His federal fraud case, which led to his expulsion from Congress, was just weeks away from going to trial.

“I betrayed the trust of my constituents and supporters. I deeply regret my conduct,” the New York Republican said, his voice trembling as he entered the plea in a Long Island courtroom.

Santos, 36, said he accepted responsibility for his crimes and intends to make amends. He faces more than six years in prison under federal sentencing guidelines and owes at least $370,000 in restitution.

Senior Federal Judge Joanna Seybert scheduled sentencing for Feb. 7.

Santos was indicted on felony charges that he stole from political donors, used campaign contributions to pay for personal expenses, lied to Congress about his wealth and collected unemployment benefits while actually working.

Santos was expelled from the U.S. House after an ethics investigation found “overwhelming evidence” that he had broken the law and exploited his public position for his own profit.

The case has been set to go to trial in early September. If that had happened, federal prosecutors said Monday that they were prepared to call some 40 witnesses, including members of Santos’ campaign, employers and family members.

Santos was once touted as a rising political star after he flipped the suburban district that covers the affluent North Shore of Long Island and a slice of the New York City borough of Queens in 2022.

But his life story began unraveling even before he was sworn into office. At the time, reports emerged that he had lied about having a career at top Wall Street firms and a college degree along with other questions swirling about his biography.

New questions then emerged about his campaign funds.

He was first indicted on federal charges in May 2023, but refused to resign from office.

Santos had previously maintained his innocence, though he said in an interview in December that a plea deal with prosecutors was “not off the table.”

Asked if he was afraid of going to prison, he told CBS 2 at the time: “I think everybody should be afraid of going to jail, it’s not a pretty place and uh, I definitely want to work very hard to avoid that as best as possible.”

Separately Monday, in Manhattan federal court, Judge Denise Cote tossed out a lawsuit in which Santos claimed that late-night host Jimmy Kimmel, ABC and Disney committed copyright infringement and unjustly enriched themselves at his expense by using videos he made on the Cameo app for a “Jimmy Kimmel Live” segment. The judge said it was clear that Kimmel used the clips, which were also posted to YouTube, for the purposes of criticism and commentary, which is fair use.

Santos had begun selling personalized videos on Cameo in December shortly after his ouster from Congress. He subsequently launched, then quickly abandoned, a longshot bid to return to Congress as an independent earlier this year.

Montana’s Supreme Court on Tuesday said it would allow the signatures of inactive voters to count on petitions seeking to qualify constitutional initiatives for the November ballot, including one to protect abortion rights.

District Court Judge Mike Menahan ruled last Tuesday that Secretary of State Christi Jacobsen’s office wrongly changed election rules to reject inactive voter signatures from three ballot initiatives after the signatures had been turned in to counties and after some of the signatures had been verified. The change to longstanding practices included reprogramming the state’s election software.

Jacobsen’s office last Thursday asked the Montana Supreme Court for an emergency order to block Menahan’s ruling that gave counties until this Wednesday to verify the signatures of inactive voters that had been rejected. Lawyers for organizations supporting the ballot initiatives and the Secretary of State’s Office agreed to the terms of the temporary restraining order blocking the secretary’s changes.

Justices said Jacobsen’s office failed to meet the requirement for an emergency order, saying she had not persuaded them that Menahan was proceeding under a mistake of law.

“We further disagree with Jacobsen that the TRO is causing a gross injustice, as Jacobsen’s actions in reprogramming the petition-processing software after county election administrators had commenced processing petitions created the circumstances that gave rise to this litigation,” justices wrote.

A hearing on an injunction to block the changes is set for Friday before Menahan.

The groups that sued — Montanans Securing Reproductive Rights and Montanans for Election Reform — alleged the state for decades had accepted signatures of inactive voters, defined as people who filed universal change-of-address forms and then failed to respond to county attempts to confirm their address. They can restore their active voter status by providing their address, showing up at the polls or requesting an absentee ballot.

Backers of the initiative to protect the right to abortion access in the state constitution said more than enough signatures had been verified by Friday’s deadline for it to be included on the ballot. Backers of initiatives to create nonpartisan primaries and another to require a candidate to win a majority of the vote to win a general election have said they also expect to have enough signatures.