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Moulton enters 2020 White House race

Rep. Seth MoultonSeth MoultonTrump slight against Gold Star families adds to military woes Overnight Defense: Congress recommends nuclear arms treaty be extended | Dems warn Turkey | Military's eighth COVID death identified Bipartisan congressional task force recommends extending nuclear treaty with Russia 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 PelosiMnuchin says he learned of Pelosi's letter to him about stimulus talks 'in the press' On The Money: Trump makes a late pitch on the economy | US economy records record GDP gains after historic COVID-19 drop | Pelosi eyes big COVID-19 deal in lame duck Pelosi challenger calls delay on COVID-19 relief bill the 'privilege of politics' 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 TrumpBiden campaign slams Facebook after thousands of ads blocked by platform's pre-election blackout Mnuchin says he learned of Pelosi's letter to him about stimulus talks 'in the press' Harris to travel to Texas Friday after polls show tie between Trump, Biden 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 WarrenWarren has expressed interest in being Biden's Treasury secretary: report The Democrats' 50 state strategy never reached rural America What a Biden administration should look like MORE (D-Mass.), Kamala HarrisKamala HarrisHarris to travel to Texas Friday after polls show tie between Trump, Biden Harris more often the target of online misinformation than Pence: report Maya Rudolph says she loves playing Kamala Harris on SNL: 'Feels like being on the side of the good guys' MORE (D-Calif.) and Bernie SandersBernie SandersThe Hill's 12:30 Report - Presented by Facebook - Election night could be a bit messy The Hill's Morning Report - Sponsored by Facebook - Trump, Biden blitz battleground states Oct. 29: Where Trump and Biden will be campaigning MORE (I-Vt.) and former Rep. Beto O'RourkeBeto O'RourkeHarris to travel to Texas Friday after polls show tie between Trump, Biden Cruz wants donors to repay K he loaned to his 2018 campaign Texas Republicans sound post-2020 alarm bells MORE (D-Texas).

Other veterans in the 2020 Democratic field include South Bend, Ind., Mayor Pete ButtigiegPete ButtigiegWhat a Biden administration should look like Conservative operatives Wohl, Burkman charged in Ohio over false robocalls LGBTQ voters must show up at the polls, or risk losing progress MORE and Rep. Tulsi GabbardTulsi GabbardHarris faces biggest moment in spotlight yet Ocasio-Cortez slams Tulsi Gabbard for amplifying ballot harvesting video Republicans call on DOJ to investigate Netflix over 'Cuties' film MORE (D-Hawaii).

CNN is reporting that former Vice President Joe BidenJoe BidenHarris to travel to Texas Friday after polls show tie between Trump, Biden Florida heat sends a dozen Trump rally attendees to hospital Harris more often the target of online misinformation than Pence: report MORE will enter the race this week.

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