(AP) — Democratic Rep. Adam Schiff, who rose to national prominence as the lead prosecutor in President Donald Trump’s first impeachment trial, said Thursday he is running for the Senate seat held by long-serving Democrat Dianne Feinstein.

The 2024 race is quickly emerging as a marquee Senate contest, even though the 89-year-old Feinstein, the oldest member of Congress, has yet to announce if she will seek another term, though her retirement is widely expected. Schiff is jumping in two weeks after Rep. Katie Porter became the first candidate to declare her campaign for the safe Democratic seat.

Schiff, a former federal prosecutor, made clear he intends to anchor his candidacy to his role as Trump’s chief antagonist in Congress. In his campaign kickoff video, he said the “biggest job of his life” was serving as impeachment manager, and he promised to continue to be a “fighter” for democracy.

“If our democracy isn’t delivering for Americans, they’ll look for alternatives, like a dangerous demagogue who promises that he alone can fix it,” Schiff said of Trump, who has announced his 2024 campaign for the presidency.

Feinstein, a former San Francisco mayor who joined the Senate in 1992, told reporters in Washington this week that she will make a decision about 2024 in the “next couple of months.”

The jockeying for the seat has created a politically awkward dynamic for Feinstein, who has broken gender barriers throughout her decadeslong career in local and national politics. In recent years, questions have arisen about her cognitive health and memory, though she has defended her effectiveness in representing a state that is home to nearly 40 million people.

Schiff, 62, said in an interview Thursday that he had spoken to Feinstein a day earlier to inform her about his plans.

“I want to make sure that everything I did was respectful of her and that I did so with her knowledge and her blessing,” Schiff told The Associated Press.

Asked if he was aware of the senator’s plans, Schiff said, “I don’t want to presume to speak for Sen. Feinstein, and I think she’s earned the right to announce her decision when she’s ready to make that announcement.”

Schiff was first elected to Congress in 2000 and represents parts of Hollywood. He has been a frequent target of conservatives — Trump in particular — since the then-GOP-led House Intelligence Committee he served on started investigating Trump’s ties to Russia in the 2016 election.

Schiff appeared frequently on television to question Trump’s actions.

That criticism intensified when Democrats took the House majority in early 2019 and he became the committee chair, and it reached a full-on roar with his role in the impeachment investigation of Trump’s dealings with Ukraine. Trump was impeached in December 2019 on charges he abused the power of the presidency to investigate rival Joe Biden and obstructed Congress’ investigation.

In an impassioned plea to the Senate in early 2020, Schiff urged Trump’s removal from office and framed the choice in moral terms. “If right doesn’t matter, we’re lost,” he said at the time.

“You know you can’t trust this president do what’s right for this country,” Schiff said. “You can trust he will do what’s right for Donald Trump. He’ll do it now. He’s done it before. He’ll do it for the next several months, he’ll do it in the election if he’s allowed to. This is why if you find him guilty you must find that he should be removed. Because right matters.”

The Republican-led Senate acquitted Trump of both charges. In 2021, he became the first president in U.S. history to be impeached twice, this time for inciting the Jan. 6 insurrection at the U.S. Capitol after he lost the 2020 election. He was again acquitted by the Senate.

Republicans are still angry about Schiff’s starring role at the impeachment trial, with new House Speaker Kevin McCarthy accusing him of using his leadership position to “lie to the American public again and again.”

McCarthy, R-Calif., said this week that he intended to block Schiff from continuing his service on the House Intelligence Committee.

With the centrist Feinstein in the twilight of her career, the race in the heavily Democratic state already is shaping up as a showcase for an ambitious, younger generation on the party’s left wing.

Both Schiff and Porter are nationally recognized — Schiff through his leading impeachment role and Porter, a favorite of the party’s progressive wing, through her tough questioning of CEOs and other witnesses at congressional hearings. Each is also a formidable small-dollar fundraiser.

Neither has run statewide before, and each would face the challenge of becoming better known beyond their Southern California districts.

Democrats are expected to dominate the contest — a Republican hasn’t won a statewide race in California since 2006, and the past two Senate elections had only Democrats on the November ballot.

The field is expected to grow, with other possible contenders including Democratic Rep. Barbara Lee, a former chair of the Congressional Black Caucus.

Asked how he would stand out in what is expected to be a crowded field, Schiff said he would emphasize his central role of national struggles over democracy and the economy.

“I think that record of leadership, that record of staunch defense of our democracy, and the way that I’ve championed an economy that works for everyone, I think are a powerful record to run on,” he said.

In his announcement video, Schiff mixed shots of his family and highlights from his courtroom work with video from the impeachment proceedings and clips of Trump and other Republicans.

He warns that the threat of extremism is not over.

“Today’s Republican Party is gutting the middle class, threatening our democracy” Schiff says. “They aren’t going to stop. We have to stop them.”