Moulton enters 2020 White House race

Rep. Seth MoultonSeth Moulton2020 Presidential Candidates Rep. Joe Kennedy has history on his side in Senate bid Mass shootings have hit 158 House districts so far this year MORE (D-Mass.) announced his 2020 presidential campaign early Monday, becoming the 20th candidate seeking the Democratic nomination.

Moulton, who emerged a leader of the Democrats challenging Rep. Nancy PelosiNancy PelosiTrump-GOP tensions over Syria show signs of easing Democratic debate starts with immediate question on Trump impeachment White House, Pentagon, Giuliani reject House subpoenas MORE's (D-Calif.) path to the Speakership last fall, said in a video that he is running because "we have to beat Donald TrumpDonald John TrumpWarren defends, Buttigieg attacks in debate that shrank the field Five takeaways from the Democratic debate in Ohio Democrats debate in Ohio: Who came out on top? MORE, and I want us to beat Donald Trump because I love this country."

The former Marine's campaign platform includes a focus on gun control, national security and addressing climate change.

“Decades of division and corruption have broken our democracy and robbed Americans of their voice,” Moulton said in his announcement video. "It's all led to an administration that's turned away from our values and is shredding our moral authority.”

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According to his campaign website, the three-term congressman will travel to the early nominating states of New Hampshire, South Carolina and Iowa this week.

Moulton, 40, has said for months that he was considering a 2020 run.

He told ABC News early Monday that Democrats have ceded issues such as patriotism, security and service to Republicans “for too long.”

“This is actually where Donald Trump is weakest,” he said. “We’ve got to take him on on these issues.”

“Seth Moulton is a Massachusetts liberal who supports higher taxes and the socialist Green New Deal," Republican National Committee spokesman Michael Ahrens said in a statement. "His presidential bid is going nowhere, just like his unsuccessful business career and his repeated failed attempts to challenge the least popular politician in DC: Nancy Pelosi."

Moulton joins a crowded field of Democratic nominees including Sens. Elizabeth WarrenElizabeth Ann WarrenWarren defends, Buttigieg attacks in debate that shrank the field Five takeaways from the Democratic debate in Ohio New study: Full-scale 'Medicare for All' costs trillion over 10 years MORE (D-Mass.), Kamala HarrisKamala Devi HarrisWarren defends, Buttigieg attacks in debate that shrank the field Five takeaways from the Democratic debate in Ohio Warren leads in speaking time during debate MORE (D-Calif.) and Bernie SandersBernie SandersWarren defends, Buttigieg attacks in debate that shrank the field Five takeaways from the Democratic debate in Ohio New study: Full-scale 'Medicare for All' costs trillion over 10 years MORE (I-Vt.) and former Rep. Beto O'RourkeBeto O'RourkeWarren defends, Buttigieg attacks in debate that shrank the field Warren leads in speaking time during debate Democrats wrangle over whether to break up Big Tech in debate first MORE (D-Texas).

Other veterans in the 2020 Democratic field include South Bend, Ind., Mayor Pete ButtigiegPeter (Pete) Paul ButtigiegWarren defends, Buttigieg attacks in debate that shrank the field Five takeaways from the Democratic debate in Ohio New study: Full-scale 'Medicare for All' costs trillion over 10 years MORE and Rep. Tulsi GabbardTulsi GabbardWarren defends, Buttigieg attacks in debate that shrank the field Warren leads in speaking time during debate Democrats debate in Ohio: Who came out on top? MORE (D-Hawaii).

CNN is reporting that former Vice President Joe BidenJoe BidenWarren defends, Buttigieg attacks in debate that shrank the field Five takeaways from the Democratic debate in Ohio New study: Full-scale 'Medicare for All' costs trillion over 10 years MORE will enter the race this week.

— Owen Daugherty contributed to this report, which was updated at 10:23 a.m.