MSNBC host Joe Scarborough said Tuesday that GOP lawmakers could no longer "pretend" to be defenders of the Constitution if they elected to support 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's emergency declaration to fund a border wall.

“We have criticized Republicans so much for bowing down to Donald Trump,” Scarborough said on MSNBC’s “Morning Joe.” “But I do have to say, this is such an obviously bright line to cross that if you vote for this national emergency, never, ever raise the Constitution again and pretend that you are a defender of it, because this is a clear violation.”

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Scarborough, a frequent critic of Trump's, later condemned the GOP for hypocrisy.

"Here you have, again, Republicans, after fighting against an imperial presidency for decades, now actually turning over power that would allow future democratic socialist presidents to declare an emergency on global warming," he said. "Or after the next school shooting, to declare a national emergency and ban semi-automatic weapons. To do just about everything that conservatives have feared for a very long time."

The comments from Scarborough came the same day the House votes on a resolution to block Trump's national emergency declaration.

Trump declared an emergency earlier this month to tap into additional funds, including from the military, for construction of his long-sought border wall. He made the announcement as he agreed to sign a congressional spending bill without the $5.7 billion he had requested for a wall.

The bill instead allocates $1.375 billion for construction of physical barriers along parts of the U.S. southern border.

The bill to block Trump's emergency declaration is expected to pass in the House because of the Democratic majority.

Multiple GOP senators, including Sen. Lisa Murkowski Lisa Ann MurkowskiSenate GOP aims to confirm Trump court pick by Oct. 29: report Senate GOP sees early Supreme Court vote as political booster shot Pence defends Trump's 'obligation' to nominate new Supreme Court justice MORE (R-Alaska) and Sen. Susan Collins Susan Margaret CollinsSenate GOP aims to confirm Trump court pick by Oct. 29: report The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Senate GOP sees early Supreme Court vote as political booster shot MORE (R-Maine), have also expressed a willingness to buck leadership and vote to block Trump's emergency declaration in the Senate.

"I would vote in favor of the resolution disapproving of the president’s national-emergency declaration, if and when it comes before the Senate," Sen. Thom Tillis Thomas (Thom) Roland TillisThe Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting OVERNIGHT ENERGY: EPA head questions connection of climate change to natural disasters | Pebble Mine executives eye future expansion in recorded conversations | EPA questions science linking widely used pesticide to brain damage in children Liberal super PAC launches ads targeting vulnerable GOP senators over SCOTUS fight MORE (R-N.C.) also wrote in a Washington Post op-ed on Monday.

Democrats are expected to need four Republicans to vote for the resolution in order for it to pass the Senate.