In an appearance Tuesday on the “The Late Show With Stephen Colbert,” Gillibrand, D-N.Y., said she was forming an exploratory committee to raise money and travel the country for her run. She is scheduled to start campaigning within days, with plans to spend the weekend in Iowa.

“I’m going to run for president of the United States because as a young mom I am going to fight for other people’s kids as hard as I would fight for my own,” she said.

Gillibrand, 52, has emerged as one of the most forceful critics of the Trump administration in the last two years. She has voted against nearly every significant nominee Trump has put forward, and rallied opposition to his congressional agenda. In the last two months, as she publicly considered a campaign, she has spoken repeatedly about the need to restore the “moral compass” of the nation.

But Gillibrand, a former corporate lawyer, has been criticized by opponents as a politician without a firm ideological bearing of her own, having transformed from a pro-gun, conservative upstate congresswoman with deep ties to Wall Street financiers to a crusading liberal who rails against guns and refuses corporate political action committee money.

Gillibrand’s 2020 announcement was widely expected after weeks of presidential buildup, in which she secured office space for a headquarters in Troy, New York, and expanded her political staff.

“The first thing I would do is restore what’s been lost: the integrity and the compassion of this country,” Gillibrand told Colbert when he asked about her Day One priorities.

Gillibrand is not the first woman or even the first member of the Senate to announce her bid; Sen. Elizabeth Warren of Massachusetts formed an exploratory committee two weeks ago.

Other senators expected to enter the race soon include Cory Booker of New Jersey and Kamala Harris of California, while Sen. Bernie Sanders, I-Vt., former Vice President Joe Biden and former Rep. Beto O’Rourke are weighing candidacies.

Gillibrand has registered little support in early presidential polls but she is still widely seen as a formidable candidate. Fiercely competitive and a prolific fundraiser — she had more than $10.5 million in the bank as of late 2018 — she has invested heavily in recent years to build up a small donor network online, as well.

Notably, Gillibrand pitched bipartisanship in her announcement. “I would bring people together to start getting things done,” she said. “If you want to get health care done, you have to bring Democrats and Republicans to the table on the shared values of this country.”

But nothing would be accomplished, she said, without taking on “the systems of power,” including “institutional racism” and corruption in Washington.

Gillibrand appeared nervous as the interview began, gripping Colbert’s hand just before making her announcement. At the end of the segment, Colbert gave her a gift basket of items to take with her on the trail, including a ticket to Michigan to ensure she campaigns there.

The 2018 midterms demonstrated the appetite among Democratic voters to elevate women into power, and Gillibrand is expected to make her advocacy for women’s causes and candidacies a key part of her campaign. For years, she has raised money for women seeking office through her Off the Sidelines PAC, which shares the name with her memoir. That work has helped her develop a national network of female donors she is expected to tap into for 2020.

She has lined up with the left flank of her party on policy positions, embracing economic populism, but she is not expected to run as explicitly ideological a campaign as rivals like Warren and, if he runs, Sanders.

Instead, Gillibrand, who has visited every county in New York each year of her Senate tenure, is expected to lean on her ability to connect with audiences on a personal level.

Her presidential announcement comes almost a decade to the day after she was appointed to the U.S. Senate — in what was then a surprise pick by then-Gov. David Paterson, who elevated Gillibrand over some better-known rivals to replace Hillary Clinton when she became secretary of state. Her Senate seat has a storied lineage with recent predecessors including Clinton, Daniel Patrick Moynihan and Robert F. Kennedy.

At the time of her appointment, Gillibrand had just won re-election to her second term in the House after seizing her Albany-area seat from a Republican incumbent in 2006. She has moved steadily to the left politically since then — abandoning her former positions on guns and immigration, in particular — as she has become one of the Democratic Party’s most reliably liberal voices.

In the Senate, she has taken on some big fights, including her successful push to repeal the “don’t ask, don’t tell” policy in the military and her continuing battle to remove sexual assault cases in the armed forces from the military chain of command. She has pushed to end the scourge of sexual harassment on college campuses and to strengthen protections for women working on Capitol Hill.

In late 2017, she was the first senator to call for the resignation of Sen. Al Franken, D-Minn., as he faced multiple accusations of sexual misconduct. Her decision — which was quickly echoed by other senators, both men and women — led to a backlash from some Democratic activists and donors who were angered that Franken was forced to resign while a president accused of harassment by multiple women remained in office.

Gillibrand’s stance on Franken came on the heels of saying that, in retrospect, President Bill Clinton’s sexual relationship with an intern would have been cause to resign, even though the Clintons had championed her early in her career. The back-to-back episodes cemented her reputation as a woman willing to buck powerful men in her own party.

Born in Albany to a political family, Gillibrand was greatly influenced by her grandmother, Dorothea Noonan, known as Polly, a powerful figure in the political machine of the longtime mayor of Albany, Erastus Corning.

Gillibrand began her career as a Manhattan lawyer in the 1990s, and has said she was inspired to get into politics by listening to Hillary Clinton, then the first lady.

She eventually ran for Congress, in 2006, in what was seen as a long-shot race against an entrenched incumbent, Rep. John E. Sweeney. The district was 93 percent white, and Republicans vastly outnumbered Democrats.

She easily secured re-election in 2008 in a House race that was the most expensive in the nation that year.

While some 2020 candidates are expected to make explicit their appeal in Middle America, Gillibrand, at least among the Democrats from coastal blue states, can point to her initial representation of a heavily Republican and more rural House district as a sign of her experience, if not electability, with such voters.

Last November, she won election to the Senate for the third time after she pledged during the campaign’s final weeks that she would serve her full six-year term.

Before her impending presidential candidacy, Gillibrand met on Saturday evening with a diverse group of two dozen women for a listening session at the home of author Letty Cottin Pogrebin. It was a wide-ranging two-hour discussion, Pogrebin said, during which Gillibrand took notes.

Among the pointed questions the senator was asked: How would she become known in the rest of America?

“Her answer was that she would proceed living room by living room,” recalled Gloria Steinem, the feminist icon, who was among the attendees and said she came away impressed by Gillibrand. “Just as she was doing with us.”

This article originally appeared in The New York Times.