Moulton enters 2020 White House race

Rep. Seth MoultonSeth Wilbur MoultonHouse lawmakers introduce bill to help those struggling with student debt Stanley McChrystal endorses Moulton for president 2020 Democrats react to 'send her back' chants at Trump rally 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 PelosiConservatives erupt in outrage against budget deal Grassley, Wyden reach deal to lower drug prices Why do Republicans keep trying to outspend Democrats in Congress? 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 Trump5 things to know about Boris Johnson Conservatives erupt in outrage against budget deal Trump says Omar will help him win Minnesota 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 WarrenPoll: Biden leads 2020 Democratic field by 15 points, followed by Sanders and Warren Warren introduces bill to cancel student loan debt for millions Democrats, advocacy groups urge Pompeo to abolish new 'unalienable rights' commission MORE (D-Mass.), Kamala HarrisKamala Devi HarrisPoll: Biden leads 2020 Democratic field by 15 points, followed by Sanders and Warren Democrats, advocacy groups urge Pompeo to abolish new 'unalienable rights' commission Biden announces plan to counteract mass incarceration MORE (D-Calif.) and Bernie SandersBernie SandersPoll: Biden leads 2020 Democratic field by 15 points, followed by Sanders and Warren Warren introduces bill to cancel student loan debt for millions Democrats, advocacy groups urge Pompeo to abolish new 'unalienable rights' commission MORE (I-Vt.) and former Rep. Beto O'RourkeBeto O'RourkeO'Rourke calls Trump event 'almost an impromptu Nuremberg rally' after 'send her back' chants Biden's lead narrows in early voting states: poll New CBS poll shows Biden with 7-point lead in New Hampshire MORE (D-Texas).

Other veterans in the 2020 Democratic field include South Bend, Ind., Mayor Pete ButtigiegPeter (Pete) Paul ButtigiegPoll: Biden leads 2020 Democratic field by 15 points, followed by Sanders and Warren Biden announces plan to counteract mass incarceration Nashville radio host blocked by employer from airing his interview with Buttigieg MORE and Rep. Tulsi GabbardTulsi GabbardPolitician targeted by Puerto Rican governor responds: 'This is an attack on all women' Puerto Ricans block major highway in protest of governor New CBS poll shows Biden with 7-point lead in New Hampshire MORE (D-Hawaii).

CNN is reporting that former Vice President Joe BidenJoe BidenPoll: Biden leads 2020 Democratic field by 15 points, followed by Sanders and Warren Booker takes swipe at Biden criminal justice reform plan Panel: Has Joe Biden been wrong on everything for 40 years? MORE will enter the race this week.

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