Sen. Kirsten Gillibrand (D-N.Y.), who quit her Democratic presidential campaign in August, endorsed former Vice President Joe Biden for the party’s nomination, calling him the “absolute best candidate to defeat President Donald Trump.”

“I’m proud to endorse @JoeBiden today,” Gillibrand wrote Thursday on Twitter, becoming the latest big-name Democrat to throw her support behind Biden. “Our country needs a president who will provide steady, honest leadership, and I believe Joe has the right experience, empathy, and character to lead. I’m excited to help him defeat Donald Trump in November.”

Biden has amassed a deep roster of support in recent weeks, with endorsements from many former 2020 rivals. Sens. Cory Booker (N.J.), Amy Klobuchar (Minn.) and Kamala Harris (Calif.) all said they’ll back him, as did former South Bend, Indiana, Mayor Pete Buttigieg and billionaire Mike Bloomberg.

“He’s the absolute best candidate to defeat President Trump, and I think he is the person who has gained the trust and the respect of the American people in a way that no one else has,” Gillibrand told The Washington Post, noting Biden was prepared to handle the coronavirus pandemic. “The truth is he’s run the strongest campaign.”

Sen. Bernie Sanders (Vt.), Biden’s last major competitor, has lagged behind in recent primaries. Biden scored major victories in Tuesday’s primaries in Florida, Arizona and Illinois, and now holds a commanding lead in delegates.

Biden thanked Gillibrand for her support, saying the lawmaker has “never been afraid to speak without fear, to be brave in the face of injustice, and to empower others to get off the sidelines.”

.@SenGillibrand has never been afraid to speak without fear, to be brave in the face of injustice, and to empower others to get off the sidelines. I'm thrilled and honored to have her support. https://t.co/3DWCZnsnqB — Joe Biden (Text Join to 30330) (@JoeBiden) March 20, 2020

Sanders said he is “assessing” his campaign after Tuesday’s losses.