Moulton enters 2020 White House race

Rep. Seth MoultonSeth Wilbur MoultonDe Blasio pitches himself as tough New Yorker who can take on 'Don the con' Moulton rolls out plan to promote national service among young Americans Moulton: Trump 'lacks the credibility' to keep US out of war with Iran 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 Patricia D'Alesandro PelosiPelosi receives John F. Kennedy Profile in Courage Award Dems walk Trump trade tightrope Tlaib calls on Amash to join impeachment resolution 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 TrumpTrump: 'I will not let Iran have nuclear weapons' Rocket attack hits Baghdad's Green Zone amid escalating tensions: reports Buttigieg on Trump tweets: 'I don't care' 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 WarrenButtigieg jokes about holding town hall same night as 'Game of Thrones' finale Buttigieg defends appearing on Fox News: Many Americans don't hear Dems' message Warren offers to help Twitter user with her love life MORE (D-Mass.), Kamala HarrisKamala Devi HarrisButtigieg defends appearing on Fox News: Many Americans don't hear Dems' message De Blasio pitches himself as tough New Yorker who can take on 'Don the con' Buttigieg condemns 'voices on Fox' for spreading 'fear' and 'lies' ahead of town hall appearance MORE (D-Calif.) and Bernie SandersBernie SandersButtigieg defends appearing on Fox News: Many Americans don't hear Dems' message Buttigieg: The future 'is personal' for me Donald Trump, president for life? We need term limits now MORE (I-Vt.) and former Rep. Beto O'RourkeBeto O'RourkeTrump hits Fox News for 'wasting airtime' with coverage of Buttigieg Overnight Health Care — Presented by Campaign for Accountability — Momentum builds for federal laws enshrining abortion rights | Missouri lawmakers approve bill banning abortions at 8 weeks | Warren unveils plan to protect abortion rights Overnight Energy: Dems dismiss Interior chief's work calendars as 'fake' | Buttigieg climate plan includes carbon tax | Poll finds growing number say climate is crucial 2020 issue MORE (D-Texas).

Other veterans in the 2020 Democratic field include South Bend, Ind., Mayor Pete ButtigiegPeter (Pete) Paul ButtigiegButtigieg jokes about holding town hall same night as 'Game of Thrones' finale Buttigieg defends appearing on Fox News: Many Americans don't hear Dems' message Buttigieg on Trump tweets: 'I don't care' MORE and Rep. Tulsi GabbardTulsi GabbardGabbard says claim her campaign is getting boost from Putin apologists is 'fake news' Momentum builds behind push to pass laws enshrining abortion rights Poll: Biden is only Dem candidate that beats Trump outside of margin of error MORE (D-Hawaii).

CNN is reporting that former Vice President Joe BidenJoe Robinette BidenButtigieg on Trump tweets: 'I don't care' Buttigieg: The future 'is personal' for me Donald Trump, president for life? We need term limits now MORE will enter the race this week.

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