A court formally arrested the mayor of Istanbul, a key rival to President Recep Tayyip Erdogan, on Sunday and ordered him jailed pending the outcome of a trial on corruption charges.

Mayor Ekrem Imamoglu was detained following a raid on his residence earlier this week, sparking the largest wave of street demonstrations in Turkey in more than a decade. It also deepened concerns over democracy and rule of law in Turkey.

His imprisonment is widely regarded as a political move to remove a major contender from the next presidential race, currently scheduled for 2028. Government officials reject the accusations and insist that Turkey’s courts operate independently.

The prosecutor’s office said the court decided to jail Imamoglu on suspicion of running a criminal organization, accepting bribes, extortion, illegally recording personal data and bid-rigging. A request for him to be imprisoned on terror-related charges was rejected although he still faces prosecution. Following the court’s ruling, Imamoglu was transferred to Silivri prison, west of Istanbul.

The Interior Ministry later announced that Imamoglu had been suspended from duty as a “temporary measure.” The municipality had previously appointed an acting mayor from its governing council.

Alongside Imamoglu, 47 other people were also jailed pending trial, including a key aide and two district mayors from Istanbul, one of whom was replaced with a government appointee. A further 44 suspects were released under judicial control.

Interior Minister Ali Yerlikaya said Sunday that 323 people were detained the previous evening over disturbances at protests.

Largely peaceful protests across Turkey have seen hundreds of thousands come out in support of Imamoglu. However, there has been some violence, with police deploying water cannons, tear gas, pepper spray and firing plastic pellets at protesters in Istanbul, Ankara and Izmir, some of whom hurled stones, fireworks and other missiles at riot police.

The formal arrest came as more than 1.5 million members of the opposition Republican People’s Party, or CHP, began holding a primary presidential election to endorse Imamoglu, the sole candidate.

The party has also set up symbolic ballot boxes nationwide to allow people who are not party members to express their support for the mayor. Large crowds gathered early Sunday to cast a “solidarity ballot.”

“This is no longer just a problem of the Republican People’s Party, but a problem of Turkish democracy,” Fusun Erben, 69, said at a polling station in Istanbul’s Kadikoy district. “We do not accept our rights being so easily usurped. We will fight until the end.”

Speaking at a polling station in Bodrum, western Turkey, engineer Mehmet Dayanc, 38, said he feared that “in the end we’ll be like Russia, a country without an opposition, where only a single man participates in elections.”

In a message posted on social media, Imamoglu called on people to show “their struggle for democracy and justice to the entire world” at the ballot box. He warned Erdogan that he would be defeated by “our righteousness, our courage, our humility, our smiling face.”

“Honestly, we are embarrassed in the name of our legal system,” Ankara Mayor Mansur Yavas, a fellow member of Imamoglu’s CHP, told reporters after casting his vote, criticizing the lack of confidentiality in the proceedings.

CHP leader Ozgur Ozel said Imamoglu’s imprisonment was reminiscent of “Italian mafia methods.” Speaking at Istanbul City Hall, he added: “Imamoglu is on the one hand in prison and on the other hand on the way to the presidency.”

The Council of Europe, which focuses on promoting human rights and democracy, slammed the decision and demanded Imamoglu’s immediate release.

A divided Supreme Court on Tuesday made it harder for environmental regulators to limit water pollution, ruling for San Francisco in a case about the discharge of raw sewage that sometimes occurs during heavy rains.

By a 5-4 vote, the court’s conservative majority ruled that the Environmental Protection Agency overstepped its authority under the Clean Water Act with water pollution permits that contain vague requirements for maintaining water quality.

The decision is the latest in which conservative justices have reined in pollution control efforts.

Justice Samuel Alito wrote for the court that EPA can set specific limits that tell cities and counties what can be discharged. But the agency lacks the authority “to include ‘end-result’ provisions,” Alito wrote, that make cities and counties responsible for maintaining the quality of the water, the Pacific Ocean in this case, into which wastewater is discharged.

“When a permit contains such requirements, a permittee that punctiliously follows every specific requirement in its permit may nevertheless face crushing penalties if the quality of the water in its receiving waters falls below the applicable standards,” he wrote.

One conservative justice, Amy Coney Barrett, joined the court’s three liberals in dissent. Limits on discharges sometimes still don’t insure water quality standards are met, Barrett wrote.

“The concern that the technology-based effluent limitations may fall short is on display in this case,” Barrett wrote, adding that “discharges from components of San Francisco’s sewer system have allegedly led to serious breaches of the water quality standards, such as ‘discoloration, scum, and floating material, including toilet paper, in Mission Creek.’”

The case produced an unusual alliance of the liberal northern California city, energy companies and business groups.

The EPA has issued thousands of the permits, known as narrative permits, over several decades, former acting general counsel Kevin Minoli said.

The narrative permits have operated almost as a backstop in case permits that quantify what can be discharged still result in unacceptable water quality, Minoli said.

With the new restrictions imposed by the court, “the question is what comes in place of those limits,” Minoli said.

Alito downplayed the impact of the decision, writing that the agency has “the tools needed” to insure water quality standards are met.

President Donald Trump signed on Saturday an executive order designating English as the official language of the United States.

The order allows government agencies and organizations that receive federal funding to choose whether to continue to offer documents and services in language other than English.

It rescinds a mandate from former President Bill Clinton that required the government and organizations that received federal funding to provide language assistance to non-English speakers.

“Establishing English as the official language will not only streamline communication but also reinforce shared national values, and create a more cohesive and efficient society,” according to the order.

“In welcoming new Americans, a policy of encouraging the learning and adoption of our national language will make the United States a shared home and empower new citizens to achieve the American dream,” the order also states. “Speaking English not only opens doors economically, but it helps newcomers engage in their communities, participate in national traditions, and give back to our society.”

More than 30 states have already passed laws designating English as their official language, according to U.S. English, a group that advocates for making English the official language in the United States.

For decades, lawmakers in Congress have introduced legislation to designate English as the official language of the U.S., but those efforts have not succeeded.

Within hours of Trump’s inauguration last month, the new administration took down the Spanish language version of the official White House website.

Hispanic advocacy groups and others expressed confusion and frustration at the change. The White House said at the time it was committed to bringing the Spanish language version of the website back online. As of Saturday, it was still not restored.

The White House did not immediately respond to a message about whether that would happen.

Trump shut down the Spanish version of the website during his first term. It was restored when President Joe Biden was inaugurated in 2021.