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 hopeful, hammered 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 Thursday morning, saying he’s failed to maintain an “unbreakable” bond with allies in Europe.

“The president talked, he was actually fairly presidential for a change, but he talked about unbreakable bonds. It’s important to remember that bonds are breakable. One of our most important allies in the Second World War was Russia, and then they became our enemy, our greatest enemy of the last 75 years,” Moulton, an Iraq War veteran, said on CNN's "New Day."

“So, trust among allies matters. Keeping up relationships, keeping up the bonds that we have built matters. And this president has failed to do that.”

2020 candidate and veteran Rep. @sethmoulton on Trump’s D-Day speech: “He talked about unbreakable bonds. ... Keeping up the bonds that we have built over the decades matters. This President has failed to do that.” https://t.co/oa6Kpx8xL6 pic.twitter.com/LjwKaDTAY4 — New Day (@NewDay) June 6, 2019

Moulton has struggled to gain traction since launching his presidential campaign in April. He is seeking to use his foreign policy experience and time in the military to differentiate himself from a crowded primary field.

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His comments come after Trump joined world leaders in Normandy, France, earlier Thursday in honoring the 75th anniversary of the D-Day invasion.

“To all of our friends and partners: Our cherished alliance was forged in the heat of battle, tested in the trials of war, and proven in the blessings of peace,” Trump said. “Our bond is unbreakable.”

The president, however, has tested traditionally strong relationships with a slate of European allies, repeatedly pushing several to boost defense spending as part of their NATO commitment, slapping tariffs on steel and aluminum imports and criticizing some for seeking to forge relationships with adversaries like Russia and North Korea.