Rep. Seth Moulton Seth MoultonThe Hill's Morning Report - Presented by Facebook - Markey defeats Kennedy; Trump lauds America's enforcers in Wisconsin Moulton fends off primary challenges in Massachusetts Portland: The Pentagon should step up or pipe down MORE (D-Mass.), a 2020 presidential candidate, said Sunday that President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE is "not a patriot."

“I think we need to take on Donald Trump, not just in his job as president, but his job as commander-in-chief, that’s where he’s weakest," Moulton, who launched his White House bid earlier this month, said on CNN's "State of the Union."

“He’s not a patriot," he added. "I mean, he is not a patriot at all.”

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Host Jake Tapper Jacob (Jake) Paul TapperThe media's misleading use of COVID-19 data Julia Louis-Dreyfus: 'We can't spend much time grieving' Ginsburg Pence aide dismisses concerns rushed vote on Trump nominee will hurt vulnerable senators MORE pressed Moulton on his comments, asking whether he thinks Trump "loves this country."

Moulton, a former Marine Corps officer, responded by pointing to Trump's response to Russian interference in the 2016 election, his criticism of veterans like the late Sen. John McCain John Sidney McCainThe Memo: Trump's strengths complicate election picture Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' Cindy McCain: Trump allegedly calling war dead 'losers' was 'pretty much' last straw before Biden endorsement MORE (R) and his feud with Gold Star father Khizr Khan.

"I don’t think a president who encourages Russia to attack us as he did during the campaign, I don’t think a president who disparages American heroes like John McCain and Captain Kahn, I don’t think a president who cozies up to Kim Jong-Un and sells out South Korea ... I don’t think that’s a president who embodies patriotism," Moulton said.

Moulton also noted Trump's lack of service in the Vietnam War. The president received a number of draft deferments, including a medical exemption for bone spurs in his feet. Trump's critics have repeatedly questioned the diagnosis, with one former senator recently challenging Trump to have his feet x-rayed.

"Patriotism is being willing to stand up and serve your country," Moulton said Sunday.