Nancy Pelosi Threatens Donald Trump Over National Emergency: 'What He's Doing Is Wrong and Republicans Know it'

House Speaker Nancy Pelosi, a California Democrat, threatened President Donald Trump with a bitter fight over his national emergency declaration to secure funding for a border wall.

At the same time, Senate Majority Leader Mitch McConnell, a Kentucky Republican, warned that the president faced losing a vote on the national emergency because some within his own party were unwilling to support it.

"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 in Texas on Monday, CNN reported. "What he's doing is wrong, and the Republicans know it."

Trump declared a national emergency over what he called a "crisis" at the U.S. southern border, claiming that undocumented migration brings crime, drug gangs and human trafficking.

He could not get the $5.7 billion from Congress, which in mid-February allocated only $1.375 for new bollard fencing along 55 miles of the border in a compromise bill.

Democrats have accused the president of "manufacturing" a crisis so that he can declare an emergency, unlock a suite of executive powers and bypass Congress to take the money for the wall from defense funds approved for other uses.

And so far, come Republicans in Congress have grown uneasy about Trump declaring a national emergency to circumvent Congress to get funding, fearing it could set a precedent that would later be used by Democrats.

There are already a number of lawsuits against the president's declaration, including one by a coalition of 16 states led by California, which claims it is an unconstitutional money-grab by an overreaching executive.

Speaking to reporters on Monday in Kentucky, McConnell said that while he would support the president's emergency declaration, he had argued against it for just that reason.

But he believes the Senate, which has a GOP majority, will vote to pass a resolution of disapproval against the national emergency that was already passed by the House, because there are enough Republicans who oppose the president's action and are willing to take action of their own.

"I think what is clear in the Senate is that there will be enough votes to pass the resolution of disapproval, which will then be vetoed by the president, and then in all likelihood the veto will be upheld in the House," McConnell said, The Hill reported.

If the resolution passes the Senate, and Trump uses his veto to preserve the national emergency, the House will need to vote by a two-thirds majority to overturn the president's veto. Congressional arithmetic suggests this is unlikely to happen.

"Hopefully, the president won't veto it," Pelosi said, CNN reported. "Or maybe he'll just withdraw it, as some of the Republican senators are asking him to do because they know that it undermines the Constitution of the United States."

She added that Trump was "asking us to ignore the oath of office that we take to protect and defend the Constitution by this declaration."

The White House did not respond immediately to a request for comment.