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.) on Monday vowed to fight 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 in Congress and the courts if he vetoed a resolution to block his emergency declaration.

"We'll fight him in the Congress, we'll fight him in the courts, and we'll fight him in the court of public opinion," Pelosi told reporters while attending an event in Texas, according to CNN . "What he's doing is wrong, and the Republicans know it."

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Pelosi added that Trump's declaration was "undermining our system of checks and balances."

She also noted that Republican senators have asked Trump to withdraw the executive action because "they know that it undermines the Constitution of the United States."





Her comments come as the Senate appears ready to pass a resolution to block Trump's emergency declaration to fund a wall along the southern border. Trump took the step after Congress passed a spending bill without the $5.7 billion he had demanded for a border wall.