California Sen. Kamala Harris announced Monday that she will run for president in 2020, joining an increasingly crowded field of Democrats seeking to challenge President Donald Trump.

Harris’ announcement, made on “Good Morning America,” comes following months of speculation surrounding the Democrat, a rising star in the party who was elected California’s junior senator in 2016 after two terms as the state’s attorney general.

Harris, 54, said she was not yet ready to make an announcement about a possible campaign. In the interim, at least three serious contenders declared their candidacies or interest in running, including Sen. Kirsten Gillibrand, D-N.Y., Rep. Tulsi Gabbard, D-Hawaii, and former Housing and Urban Development Secretary Julian Castro.

“The thing about Dr. King that always inspires me is that he was aspirational. He was aspirational like our country is aspirational. We know that we’ve not yet reached those ideals. But our strength is that we fight to reach those ideals,” the senator said. “So today, the day we celebrate Dr. King, is a very special day for all of us as Americans and I’m honored to be able to make my announcement on the day we commemorate him.” says Kamala Harris.