WASHINGTON (AP) — Voters in the nation’s capital head to the polls on Tuesday to select party candidates for mayor and the district’s delegate to Congress, an election taking place as Washington undergoes major change under President Donald Trump’s administration.

The primary marks the first time in a generation that D.C. residents will vote for a new mayor and delegate in the same election. And in an overwhelmingly Democratic city, that party’s winner is expected to come out on top in the general election in November.

The most prominent race is for mayor after Muriel Bowser, who was first elected in 2014, decided not to seek a fourth term. Democratic front-runners Janeese Lewis George and Kenyan McDuffie are hoping to replace her.

The district’s long-serving congressional delegate Eleanor Holmes Norton is also stepping down, with top candidates council member Brooke Pinto and at-large council member Robert White Jr. vying for the role. Republican Denise Rosado, an immigration lawyer, is running unopposed.

The primary will include rank choice voting for the first time, which D.C. election officials have warned could delay results for days.

Trump looms large over the vote

Central to all the campaigns has been the city’s fraught relationship with the Trump administration and the federal government. The city has limited autonomy and federal leaders retain significant control over local affairs, including the approval of the budget and laws passed by the D.C. Council.

That autonomy has been further squeezed under Trump, who launched a federal law enforcement surge last summer and sent in the National Guard for an ongoing, open-ended deployment. Trump’s efforts to downsize the federal government also roiled the capital region, costing thousands of people their jobs. He has also been reshaping the city by removing or renovating storied landmarks and putting his name or image on buildings.

Trump just last week threatened a new federal takeover of Washington, when asked about his response to a potential victory by Lewis George, a democratic socialist.

“Maybe we’d take back Washington, run it on the federal basis,” he said.

Bowser found herself walking a fine line between staying in Trump’s good graces and responding to the concerns of constituents, many of whom said she didn’t push back hard enough on Trump’s actions.

Republicans in Congress meanwhile have used their oversight authority to challenge the local government’s limited autonomy.

“We are the capital of the United States, and it’s an incredibly symbolic place, this city,” said Amanda Huron, a professor at the University of the District of Columbia who teaches courses on D.C. history and politics.

She said it’s important to remind the public that what the federal government does to its capital city is a harbinger of “how it’s going to treat the rest of the country as well.”

Federal intervention, affordability among candidates’ top priorities

Lewis George, in responding to questions sent by The Associated Press, said her top priority is addressing “the affordability crisis here in DC, which the Trump administration has only made worse by unjustly firing federal employees en masse and militarizing our streets.”

McDuffie said his top priority is public safety. He would add 1,000 police officers over four years and take a public health approach to violence reduction that would include a focus on mental health.

Other candidates for mayor include former council member Vincent Orange and Hope Solomon, a former federal contractor who lost her job because of cuts by the Department of Government Efficiency.

Some residents have expressed concern on how Trump will react to pushback. Pat Wheeler, who lives in Washington, said candidates must be realistic. Trump still has enormous power over the Republican Congress and could easily order members to take steps against the city’s home rule authority, she said.

Five people are seeking to replace Norton, who is finishing her 18th term representing D.C. in Congress. Norton, 89, faced heavy pressure to stand down by critics, including her former chief of staff, who said she was diminished and not capable of mounting the defense the moment called for against Trump.

Pinto and White both say their top priority for the city is self-governance along with affordability for middle and working class residents.

Other candidates seeking the Democratic spot on the ticket include Trent Holbrook, a former Norton staffer; Kenney Zalesne, the former Deputy National Finance Chair of the Democratic National Committee; and Gregory Jaczko, former chairman of the U.S. Nuclear Regulatory Commission.

The Lincoln Memorial Reflecting Pool has become overrun with algae just days after the landmark underwent a multimillion-dollar renovation, leaving visitors wondering if it will be cleared in time for 4th of July celebrations marking America’s 250th anniversary.

Photos taken over the weekend show National Park Service employees working to clear algae from the pool, which had turned the water green. The pool’s basin had been painted “American Flag Blue,” a dark navy, ahead of Independence Day. The pool in Washington, DC, measures about 2,000 feet in length and 160 feet in width.

The renovation began in April and was completed earlier this month. According to The New York Times, the pool repairs cost a whopping $13.1 million.

In a previous statement to USA TODAY, the Department of the Interior said the new color would improve the pool’s reflective properties compared to the old gray concrete, which had collected algae and turned “a slimy green.”

An environmental expert tells USA TODAY the green could linger for several months. Here’s what we know.

Expert: July temperatures could be bad news for Reflecting Pool

There are doubts about whether the Reflecting Pool will return to its glistening blue color ahead of the holiday.