House Republicans who still maintain President Donald Trump did not lay out a quid pro quo arrangement with the president of Ukraine are "living in la-la land," Rep. Seth Moulton said Tuesday, after the release of a testimony transcript from EU Ambassador Gordon Sondland.

“Some of these guys are living in la-la land and trying to blindly support the president,” Moulton told Jim Braude while on Greater Boston Tuesday.

In testimony transcript released Tuesday, Sondland described his role in outlining a quid pro quo arrangement presented to Ukraine that made U.S. aid for Ukraine contingent upon that country agreeing to investigate former Vice President Joe Biden and his son, Hunter, as requested by Trump.

But Moulton said he believes sentiment is starting to turn against Trump in the Senate, even among Republicans.

“I think you’re starting to see very guarded statements from many of our senators who are trying to look at their place in history,” he said.

Moulton also discussed the president's decision last month to abruptly withdraw U.S. troops from northern Syria, leaving America's former Kurdish allies vulnerable to military action from Turkey.

Moulton, a combat veteran of the Iraq War, expressed concern that the about-face would prevent potential allies from working with U.S. troops.

"I'm very worried that they won't [work with the U.S.], and that will put American troops at risk — that Americans will die because we would be unable to get these critical partners on the ground in the future," he said.

“It’s our credibility as a nation. It’s the personal credibility of our troops on the line," he added.