Moulton enters 2020 White House race

Rep. Seth MoultonSeth MoultonEx-CBO director calls for more than trillion in coronavirus stimulus spending Overnight Defense: Trump's move to use military in US sparks backlash | Defense officials take heat | Air Force head calls Floyd's death 'a national tragedy' Democrats blast Trump's use of military against protests 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 PelosiNRCC turns up heat on vulnerable Democrats over Omar's call to abolish police Shocking job numbers raise hopes for quicker recovery Engel primary challenger hits million in donations 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 TrumpTwitter CEO: 'Not true' that removing Trump campaign video was illegal, as president has claimed Biden formally clinches Democratic presidential nomination Barr says he didn't give 'tactical' command to clear Lafayette protesters 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 WarrenTwitter CEO: 'Not true' that removing Trump campaign video was illegal, as president has claimed Biden formally clinches Democratic presidential nomination Warren, Pressley introduce bill to make it a crime for police officers to deny medical care to people in custody MORE (D-Mass.), Kamala HarrisKamala Devi HarrisBiden formally clinches Democratic presidential nomination Kamala Harris to Trump: 'Keep George Floyd's name out of your mouth' New England Patriots owner pledges M to social justice causes MORE (D-Calif.) and Bernie SandersBernie SandersBiden formally clinches Democratic presidential nomination OVERNIGHT ENERGY: Trump signs order removing environmental reviews for major projects | New Trump air rule will limit future pollution regulations, critics say | DNC climate group calls for larger federal investment on climate than Biden plan Google: Chinese and Iranian hackers targeting Biden, Trump campaigns MORE (I-Vt.) and former Rep. Beto O'RourkeBeto O'RourkeBiden will help close out Texas Democrats' virtual convention: report O'Rourke on Texas reopening: 'Dangerous, dumb and weak' Parties gear up for battle over Texas state House MORE (D-Texas).

Other veterans in the 2020 Democratic field include South Bend, Ind., Mayor Pete ButtigiegPete ButtigiegScaled-back Pride Month poses challenges for fundraising, outreach Biden hopes to pick VP by Aug. 1 It's as if a Trump operative infiltrated the Democratic primary process MORE and Rep. Tulsi GabbardTulsi GabbardGabbard drops defamation lawsuit against Clinton It's as if a Trump operative infiltrated the Democratic primary process 125 lawmakers urge Trump administration to support National Guard troops amid pandemic MORE (D-Hawaii).

CNN is reporting that former Vice President Joe BidenJoe BidenBiden formally clinches Democratic presidential nomination The Memo: Job numbers boost Trump and challenge Biden Chris Wallace: Jobs numbers show 'the political resilience of Donald Trump' MORE will enter the race this week.

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