Sen. Kamala Harris (D-Calif.) announced Monday on “Good Morning America” that she is running for president in 2020.

“I feel a sense of responsibility to stand up and fight for the best of who we are,” she said. “I love my country.”

BREAKING: @KamalaHarris announces this morning on @GMA that she will officially be running for president in 2020. "I'm very excited about it." https://t.co/W1vUNMab63 pic.twitter.com/Jhklmo3Oa9 — Good Morning America (@GMA) January 21, 2019

JUST IN: @KamalaHarris on announcing she will be running for president in 2020: "I feel a responsibility to stand up and fight for who we are." https://t.co/qUX1sERxxZ pic.twitter.com/NcSHFTRIny — Good Morning America (@GMA) January 21, 2019

.@KamalaHarris on why she is announcing she will be running for president on #MLKDay: MLK "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." https://t.co/qUX1sERxxZ pic.twitter.com/1vu46SLZA1 — Good Morning America (@GMA) January 21, 2019

Sen. @KamalaHarris on why she's running for president: "The American people deserve to have someone who is going to fight for them...and put them in front of self-interest." https://t.co/qUX1sERxxZ pic.twitter.com/dERejwTgdF — Good Morning America (@GMA) January 21, 2019

Harris joins a growing field of Democratic candidates looking to take on President Trump in the next election, including Sens. Elizabeth Warren (D-MA), Kirsten Gillibrand (D-NY), Rep. Tulsi Gabbard (D-Hawaii), and former Housing and Urban Development Secretary Julian Castro.

In a video released Monday, Harris says she's seeking "truth, justice, decency, equality, freedom [and] democracy," which she argues are "all on the line now."

"The future of our country depends on you and millions of others lifting our voices to fight for our American values. That’s why I’m running for president of the United States," Harris says. "I’m running to lift those voices. To bring our voices together."