Nearly two dozen former GOP lawmakers are urging Republicans to oppose 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 national emergency declaration.

The former lawmakers in a letter published in Politico Playbook on Monday remind Republican lawmakers of an oath to “put the country and its Constitution above everything, including party politics or loyalty to a president.”

Five former Republican senators and 19 former GOP members of the House, who all served between 1967 and 2013, signed the letter. They ask current Republicans to “pass a joint resolution terminating” the national emergency.

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“We who have signed this letter are no longer Members of Congress but that oath still burns within us,” they write. “That is why we are coming together to urge those of you who are now charged with upholding the authority of the first branch of government to resist efforts to surrender those powers to a president.”

Trump declared a national emergency earlier this month after Congress rejected funding for his proposed wall along the southern border.

The House is expected to vote this week on a resolution to block the declaration. The resolution was backed by one Republican lawmaker, 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.).

Trump's emergency declaration has already drawn at least five legal challenges and has been widely condemned, including from a group of nearly 60 former national security officials.

The ex-lawmakers argue that the declaration hurts constituents by allowing the president to circumvent Congress’s power of the purse and undermine “true representative government.”

They also warn current Republicans that a future Democratic president could use the same national emergency powers to advance their own legislation.

“What will you do when a president of another party uses the precedent you are establishing to impose policies to which you are unalterably opposed?” they ask. “There is no way around this difficulty: what powers are ceded to a president whose policies you support may also be used by presidents whose policies you abhor.”

The former lawmakers end the letter by urging current Republicans to “honor your oath of office” and pass a joint resolution against the emergency declaration.

“You were sent to Congress to be the voice of the people,” they write. “That is an awesome burden and it may require you to exercise restraint to protect the constitutional model—that which is the root of American exceptionalism—and to keep it from being sacrificed on the altar of expediency.”