Rep. John Yarmuth John Allen YarmuthGOP, White House struggle to unite behind COVID-19 relief House seeks ways to honor John Lewis Karen Bass's star rises after leading police reform push MORE (D-Ky.) said Sunday that he believes a group of lawmakers invited to Camp David over the weekend by Mick Mulvaney Mick MulvaneyMick Mulvaney to start hedge fund Fauci says positive White House task force reports don't always match what he hears on the ground Bottom line MORE could have come to an agreement on border security "in less than a day" if the acting White House chief of staff were president.

Yarmuth indicated on ABC's "This Week" that he and other lawmakers had productive discussions at Camp David, but that outside factors prevent them from coming to an agreement.

"If [Rep. Tom Graves John (Tom) Thomas GravesRep. Tom Graves announces early retirement Democrat in race against Marjorie Taylor Greene drops out McEnany: Trump 'hasn't done deep dive' on anti-Muslim views of Loomer, Greene MORE (R-Ga.)] and I and the group that was up at Camp David, including Mick Mulvaney, were left to our own devices, we would’ve solved it in less than a day," he said. "And if Mick Mulvaney were president, we could’ve solved it."

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"The problem is … we have people of goodwill and intelligence and thoughtfulness who actually can negotiate all these things very easily, but then the outside world intervenes," Yarmuth added.

The Democrat noted that President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE and Speaker Nancy Pelosi Nancy PelosiPelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare House lawmakers reach deal to avert shutdown Centrist Democrats 'strongly considering' discharge petition on GOP PPP bill MORE (D-Calif.), frequent targets of partisan criticism, are not the only ones to blame for difficulties in talks. He cited "the right-wing media" and "left-wing organizations" as other sources that make it harder to reach a compromise.

"We have so many outside pressures that make it very, very difficult for us to come to a logical compromise and then sell it," Yarmuth said. "I don’t know the answer to that, but we could’ve gotten it done this weekend."

Joined my colleague @RepTomGraves to discuss the latest on government funding negotiations with @GStephanopoulos on @ThisWeekABC today. pic.twitter.com/4NMNqIclFH — Rep. John Yarmuth (@RepJohnYarmuth) February 10, 2019

Trump triggered a recent 35-day government shutdown with his demand for $5.7 billion for a wall along the U.S.-Mexico border. Democrats have offered funding for other border security measures, but no money for the wall.

The president agreed to reopen the government until Feb. 15 while a bipartisan group of lawmakers negotiate a deal to fund border security. Some members of the group expressed optimism a deal could be reached by Monday, but negotiations appeared to have stalled.

The president has threatened to declare a national emergency if needed to secure funding for the border wall. Several Republicans have expressed skepticism about such a move, however, which would likely prompt swift legal challenges.