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 (R-Mich.), the only known GOP lawmaker to co-sponsor a resolution to block 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, accused fellow Republicans on Saturday of "cry[ing] out for a king" to go around Congress.

The libertarian-leaning congressman urged members of his own party on Twitter to be "faithful" to the Constitution and reject Trump's plan to "usurp legislative powers" with a declaration aimed at reallocating funding for construction of a barrier at the U.S.-Mexico border.

"The same congressional Republicans who joined me in blasting Pres. Obama’s executive overreach now cry out for a king to usurp legislative powers. If your faithfulness to the Constitution depends on which party controls the White House, then you are not faithful to it," Amash tweeted.

The same congressional Republicans who joined me in blasting Pres. Obama’s executive overreach now cry out for a king to usurp legislative powers. If your faithfulness to the Constitution depends on which party controls the White House, then you are not faithful to it. — Justin Amash (@justinamash) February 23, 2019

Amash is a frequent critic of the president, and in a previous tweet last week following Trump's announcement accused the president of trying to "circumvent" Congress with his emergency declaration over illegal border crossings.

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"A national emergency declaration for a non-emergency is void. A prerequisite for declaring an emergency is that the situation requires immediate action and Congress does not have an opportunity to act. @POTUS @realDonaldTrump is attempting to circumvent our constitutional system," Amash wrote then.

Democrats are scheduled to vote Tuesday on a resolution that would block Trump's national emergency declaration, a resolution that the president has already vowed to veto if it manages to pass both chambers of Congress.

The measure is likely to pass the Democratic-controlled House, and enough Republicans in the Senate have expressed reservations about Trump's announcement to raise the possibility of it passing that chamber as well. Trump, meanwhile, has predicted that members of his own party will stick with him and support him over the move.

Trump hopes to fund the remainder of his plan to build a wall along the U.S.-Mexico border with funds allocated through a national emergency declaration after Congress refused to give him the $5.7 billion he requested in a bill to avert a government shutdown this month.