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 said Friday that he will veto a resolution brought by House Democrats in an attempt to counter his national emergency declaration over illegal border crossings.

The president told reporters Friday afternoon that he will "100 percent" veto the resolution if it manages to pass both the Democratic-held House and GOP-led Senate, though he expressed confidence that Republican senators would continue to support him in his declaration.

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"Will I veto it? 100 percent. 100 percent. And I don't think it survives a veto. We have too many smart people that want border security, so I can't imagine if it survives a veto, but i will veto it. Yes," Trump told reporters.

Pressed on whether congressional Republicans would stand firm in their support for him, Trump expressed confidence, saying "I think they'll stick."

"Everybody knows we need border security. We need a wall. I think it's a very bad subject for the Democrats," he said.

Democrats introduced the resolution in the House on Friday. The measure is expected to pass the House, but will need to win GOP support to get through the Senate.

Speaker Nancy Pelosi Nancy PelosiPelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare House lawmakers reach deal to avert shutdown Centrist Democrats 'strongly considering' discharge petition on GOP PPP bill MORE (D-Calif.) urged Democrats to sign on to the resolution in a letter. The measure's text states that Trump's declaration of an emergency over border crossings is "hereby terminated."

"President Trump’s emergency declaration proclamation undermines the separation of powers and Congress’s power of the purse, a power exclusively reserved by the text of the Constitution to the first branch of government, the Legislative branch, a branch co-equal to the Executive," she wrote on Wednesday.

While Republicans control the Senate, several GOP senators have expressed reservations about Trump's national emergency declaration.

Sen. Lindsey Graham Lindsey Olin GrahamSenate 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-S.C.) predicted on Friday that a "handful" of Republicans would back a resolution to block Trump's emergency declaration to construct his long-desired U.S.-Mexico border wall.