California Sen. Dianne Feinstein, the U.S. Senate’s oldest member, tweeted Monday morning that she is running for re-election, ending the “will-she-or-won’t-she” parlor game that has riveted California politics for months.

“Lots more to do: ending gun violence, combating climate change, access to healthcare,” Feinstein wrote. “I’m all in!”

A former mayor of San Francisco first elected to the Senate in 1992, Feinstein has coasted to victory in past re-election races. Her decision to run for a fifth full term sets up a 2018 Senate race that would normally be another cakewalk for her.

But the senior senator has faced withering criticism this year from some liberal activists who accuse her of not being tough enough on President Donald Trump, and she could draw a strong primary challenger from the left.

A recent Public Policy Institute of California poll found that while Feinstein, 84, has high approval ratings, a majority of likely California voters would prefer her to retire and not run again.

“She should be preparing for a battle,” said Jack Pitney, a political science professor at Claremont McKenna College. “All the energy in the Democratic party is on the progressive side — I don’t see anybody out there jumping up and down yelling ‘hooray’ for compromise and moderation.”

I am running for reelection to the Senate. Lots more to do: ending gun violence, combating climate change, access to healthcare. I’m all in! — Dianne Feinstein (@DianneFeinstein) October 9, 2017

The timing of Feinstein’s tweet was questionable. Her re-election announcement — from a campaign Twitter account that’s been dormant since 2013 — came amid raging Wine Country wildfires that killed two people as of Monday afternoon and are a frightening center of attention for her northern California base.

Longtime Feinstein campaign consultant Bill Carrick said the senator was always planning to make an announcement in October, and decided to make it public as she returned to California for a series of fundraising events this week.

“This will be fun,” Carrick said Monday morning. “She’s jacked up about it, she’s ready to go.”

The most prominent candidate seen as a potential primary challenger is State Senate President Pro Tem Kevin de León, who criticized Feinstein after she urged patience for Trump. De León declined to comment through a spokesperson on Monday.

No major Republican elected officials in the state have publicly voiced an interest in running next year, but former Olympian and transgender activist Caitlyn Jenner has said she’s considering jumping in the race as a Republican.

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Trump fighter Sen. Kamala Harris edging Feinstein in popularity Feinstein is holding a fundraiser with tech mogul Elon Musk on Monday at the Hawthorne, Calif., headquarters of his company SpaceX, and another fundraiser Tuesday with L.A. Mayor Eric Garcetti and his wife. Her campaign committee had $3,568,090 cash on hand at the end of June, according to Federal Election Commission records.

She got a quick vote of confidence from her fellow California senator, Kamala Harris. “We are better off with her leadership and I look forward to continuing to fight together for California in the Senate,” Harris wrote in a Facebook post. Lt. Gov. Gavin Newsom, who is running for governor, also publicly backed her.

But Rep. Ro Khanna, the Democrat who represents Fremont and Santa Clara, said in an interview that he believed Feinstein was “out of touch of the progressive values of the future of California.”

“I respect her service to our state and country, but I think it’s time to move on,” Khanna said, citing Feinstein’s support for the Iraq War and the Patriot Act. While Khanna said he is “committed to my district,” he said he has urged progressives such as Rep. Barbara Lee, D-Oakland, and former Secretary of Labor and UC Berkeley professor Robert Reich to challenge Feinstein.

Lee said Monday night that she will not run. “I am focused on representing California’s 13th Congressional district and resisting the hateful, un-American agenda being advanced by Donald Trump and Republicans in Congress,” she said in a statement. Reich was not available to comment, an assistant said.

Other potential Democratic candidates include environmental activist Tom Steyer — who said he would make an announcement about his plans “very soon” — and Rep. Eric Swalwell, D-Pleasanton — who said he was “focused on my work” in Congress.

One quote you can expect to hear in any Democratic primary campaign: Feinstein saying that Trump “can be a good president” if he changes his approach, a remark that elicited boos at a San Francisco event in August.

“While Dianne Feinstein’s legacy is great in a lot of ways, the question is whether she’s the right senator in this moment,” said Aram Fischer, one of the leaders of Indivisible San Francisco, an anti-Trump group that has protested Feinstein at several events. “She’s a compromiser in a time of bomb-throwers.”

But Feinstein is still beloved by many Golden State Democrats. She might get a popularity boost with her return to the front lines of the national gun control debate as she fights for a bill to ban “bump stocks,” a device used by the gunman who killed 58 people in Las Vegas last week. The bill, which is receiving muted support from some Republicans, could be the first substantive gun control legislation to pass Congress in years.

“On this issue alone, she should be re-elected,” said Caitlin King, a volunteer in Pacifica with the gun control group Moms Demand Acton. “She’s always been out front on this.”