Sen. Kamala Harris (D-Calif.) (shown above left) became the latest person to announce her bid for the presidency on Monday in what is already starting to look like a competitive field.

President Donald Trump has earned  both praise and scorn for the aggressive way he’s pursued his agenda. Harris has been considered a possible challenger to the president alongside a handful of other politicians who have announced or are considering a run in 2020.

Here’s a look at who’s has jumped into the race thus far — and who still might do so.

Former Rep. John Delaney (D-Md.) became the first Democrat in July 2017 to announce he was running for president in 2020. Rep. David Trone (D-Md.) was elected to succeed him after he announced he would not run for another term.

He had held the seat since 2013.

Related: Kamala Harris, California Democrat, Announces 2020 Run

Delaney has made economic prosperity, national security and fixing unjust institutions his main priorities. His campaign is also looking to create a unified coalition from across the political spectrum to defeat the president and his agenda.

Rep. Tulsi Gabbard (D-Hawaii) (above right) also announced the launch of a campaign to seek the Democratic nomination for the presidency on January 11. She has been a rising figure in the party since she served as vice-chairman of the Democratic National Committee (DNC) during the lead-up to the 2016 presidential election.

Former Secretary of Housing and Urban Development Julián Castro officially launched his presidential campaign for the Democratic nomination on January 12. He’s made immigration a focus given that the issue is at the forefront of the national debate.

Trump has attempted to crack down on illegal immigration, but Democrats have slammed his approach.

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Former congressional candidate Richard Ojeda also launched a campaign on November 12 in the hope of getting the Democratic presidential nomination. The retired army major is running on a platform that includes Medicare for All, cannabis legalization, anti-lobbyist and government accountability.

New York businessman Andrew Yang launched his presidential campaign for 2020 on November 6. His campaign has been focused on the technology and the negative impact it can have on jobs and society.

His nonprofit group trains young professionals to work for startups in emerging cities.

Related: Gillibrand Rips Trump’s DACA Compromise Idea

Sen. Kirsten Gillibrand (D-N.Y.) and Sen. Elizabeth Warren (D-Mass.) both have announced they’ve formed exploratory committees.

The committees are used to determine the feasibility of a run for office. Both individuals are considered possible contenders, given their rise within the party and their fights against the president.

Other potential contenders include former Vice President Joe Biden, Sen. Sherrod Brown (D-Ohio), former Rep. Beto O’Rourke (D-Texas), Sen. Bernie Sanders (I-Vt.),  Sen. Amy Klobuchar (D-Minn.) and Sen. Cory Booker (D-N.J.).

But they have not yet announced whether they officially will run or not.

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