GOP Rep. Justin Amash Justin AmashCentrist Democrats 'strongly considering' discharge petition on GOP PPP bill On The Trail: How Nancy Pelosi could improbably become president History is on Edward Snowden's side: Now it's time to give him a full pardon MORE (Mich.) on Sunday denounced 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, saying that Trump violated the Constitution by moving forward with the executive action.

“I think the president is violating our constitutional system. And I don't think Congress can grant legislative powers to the president by statute," Amash said on CNN's "State of the Union." "You can't just pass a statute that says, 'The president now has appropriations power' and bypass Congress. I don’t think that’s allowed under our constitutional system."

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Asked if he thought Republicans supporting this declaration were abdicating their responsibilities to the Constitution, Amash said "yes."

"I don't think that they're all intending to do that," he added. "I think many of them are trying to make legal arguments. They say, well, Congress has passed legislation giving the president this power. I don’t think that they’re thinking to themselves, 'oh I just want the president to violate the Constitution.' "

But Amash said Congress is the best check on executive action and that the body had to "protect" its own "power."

Trump declared a national emergency last month after Congress passed a spending bill without the $5.7 billion he demanded for a wall along the U.S.-Mexico border.

But his emergency declaration has faced opposition from many House and Senate lawmakers. Thirteen Republicans, including Amash, bucked leadership last week and voted with House Democrats for a resolution blocking the executive order.

Sen. Rand Paul Randal (Rand) Howard PaulSecond GOP senator to quarantine after exposure to coronavirus GOP senator to quarantine after coronavirus exposure The Hill's Morning Report - Sponsored by National Industries for the Blind - Trump seeks to flip 'Rage' narrative; Dems block COVID-19 bill MORE (Ky.) on Saturday became the fourth GOP senator to say he'd support the resolution, clinching a bipartisan majority in the upper chamber.

GOP Sens. Susan Collins (Maine), Thom Tillis (N.C.) and Lisa Murkowski (Alaska) have already said they would vote for the resolution.

Trump has said he would veto the resolution of disapproval if it reached his desk.

“I really think that Republicans that vote against border security and the wall, I think you know, I’ve been OK at predicting things, I think they put themselves at great jeopardy,” he said to Fox News’s Sean Hannity last week.

Amash has repeatedly condemned Trump over the emergency declaration. He said in January that Trump couldn't "claim emergency powers for non-emergency actions whenever Congress doesn’t legislate the way he wants."