President Donald Trump Will Likely Veto Congressional Disapproval of National Emergency Declaration

President Donald Trump could issue the first veto of his administration if lawmakers propose a resolution to disapprove his national emergency declaration to build a barrier along the U.S.-Mexico border.

During an appearance on Fox News Sunday, Stephen Miller, a senior adviser in the White House, said the president "is going to protect his national emergency declaration."

Miller was asked whether or not the president would veto any Congressional disapproval. And he said it was "guaranteed" after repeating himself.

Elected officials, one state's attorney general and some civil groups have vowed to block the president's call for a national emergency, whether through legal action or issuing resolutions of disapproval.

The president first threatened last year to use his power under the National Emergencies Act to call a national emergency on the U.S.-Mexico border. At the time, it looked like the government could go into a partial shutdown if Congress didn't fund his $5.7 billion proposed border wall. Though he didn't use that power, the government shut down for a record 35 days.

When a spending bill signed last week provided only about a quarter of wall funding, the president signed the spending bill and then issued a national emergency, circumventing Congress to pay for the wall.

On CBS' Face the Nation Sunday, Sen. Chris Coons (D-Del.) said Congress should prevent the president from "getting around" the congressional process.

"I do think that we should not set the terrible precedent of letting a president declare a national emergency simply as a way of getting around the congressional appropriations process," Coons said.

On ABC's This Week, California Attorney Gen. Xavier Becerra said the Golden State would "imminently" file a lawsuit to block the president's order.

The American Civil Liberties Union said it would take legal action against the order. On Saturday, Public Citizen, a watchdog group, filed a lawsuit on behalf of three Texas landowners with property on the southern border.

While most Democrat will pledge against the president's order, some Republicans will try to block it as well. However, the White House doesn't believe there will be enough votes to override a veto, the Associated Press reports. Rep. Jim Jordan, an Ohio Republican and Trump ally, told ABC there were probably enough House Republicans to prevent an override.

"I think there are plenty of votes in the House to make sure that there's no override of the president's veto," Jordan said. "So it's going to be settled in court, we'll have to wait and see."

Rep. Will Hurd, a Republican whose district encompasses more than half the Texas-Mexico border, told CBS he feels the president's power to call a national emergency to build a wall "sets a dangerous precedent."

"My concern is our government wasn't designed to operate by national emergency," Hurd said.