Ahead of a Senate vote on a resolution to block President Trump's declaration of a national emergency at the southern border, Vice President Mike Pence urged Republican lawmakers to stand with the president.

Due to the small Republican majority in the Senate -- 53-47-- it takes only four Republicans to vote in favor of the bill to block the declaration.

The measure was an effort by Trump to steer an extra $3.6 billion to build the border wall. If the move is blocked, Trump could use his first veto since taking office.

Pence, however, told "Fox & Friends’" Pete Hegseth he hopes it doesn't come to that.

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He said the crisis at the southern border is "undeniable," despite claims from Democrats that it's "manufactured" by the Trump administration.

“A vote against President Trump's national emergency is a vote against border security," Pence said. "A vote against the president's national emergency declaration is a vote to deny the humanitarian and security crisis that's happening at our southern border."

He continued, “The president has the authority under the National Emergencies Act. Vote down the resolution of disapproval. Stand with the president and stand for border security. That's what the American people want.”

Watch the "Fox & Friends" interview above, and see Hegseth speak to Homeland Security Secretary Kirstjen Nielsen below.

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