Should he become the fourth Republican to support the resolution, the Senate will have a simple majority – 51 senators – to send the resolution to the president's desk in an astonishing rebuke to the president.

Alexander said that already has congressional funding authority to build the wall he wants on the southern border without resorting to a “dangerous national emergency precedent.”

In an address on the Senate floor, he urged the president to ask his lawyers to “take a second look” at existing funding authorities that don’t require a national emergency.

“I support what the president wants to do on border security, but not the way he has been advised to do it. It is unnecessary and unwise to turn a border crisis into a constitutional crisis about separation of powers when the president already has congressional funding authority to build the 234 miles of border wall that he requested in his January 6 letter to the Senate,” Alexander said.

\"PHOTO:
CBP, FILE
PHOTO: A photo released by the Customs and Border Protection shows a vehicle barrier on the U.S.-Mexico border near Santa Teresa, N.M., Jan. 18, 2018.
>

Trump declared a national emergency at the southern border on Feb. 15, taking executive action to obtain billions of dollars for his border wall on top of $1.4 billion Congress sent him earlier this month for border fencing.

\"We do have an emergency,\" Trump told a gathering of governors at the White House on Monday. \"We have an emergency of people pouring into our country that we don't want -- criminals, smugglers. We have drugs pouring into our country. We can't have it.\"

The House passed its version of the resolution earlier this week. The bill passed 245-182, with just 13 Republicans joining 232 Democrats to approve the measure.

The Senate is expected the considered the measure in the coming weeks, setting up another showdown with Trump.

The president has made clear he will veto the resolution and it is highly unlikely Congress has the votes to override his veto.

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