"It seems to me that he's gonna have to go it alone, but there could be a war within the Republican Party over the wall," Graham said.

In Greenville, @LindseyGrahamSC says he’s “not very optimistic” about the odds of a wall funding deal with Democrats.



“It seems to me that (Trump) is going to have to go it alone. But there could be a war within the Republican Party over the wall...” #scpol pic.twitter.com/DMpfB2UgwT — Jamie Lovegrove (@jslovegrove) February 4, 2019

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Graham added that he would "stand with" Trump if he declares a national emergency to construct the U.S.-Mexico border wall and urged his Republican colleagues to "get behind the president" if he goes down that path.

"To any Republican who denies the president the ability to act as commander in chief, you're going to create a real problem within the party," Graham said.

Congress has until Feb. 15 to get a deal on the U.S.-Mexico border wall and prevent a second partial shutdown, which would impact roughly a quarter of the government.

Trump has repeatedly cast doubt on the conference committee's ability to get an agreement with Democrats. Graham echoed him on Monday, saying he was not "very optimistic" about the chances of getting a deal.

The president has dismissed the talks as a "waste of time" and repeatedly hinted that he could declare an emergency to construct the border wall if Congress misses next week's deadline.

Sen.(R-S.C.) warned on Monday that there could be a “war” among Republicans ifdeclared a national emergency to build the U.S.-Mexico border wall.Graham, speaking in South Carolina, acknowledged that the idea divides Republicans, who he argued should unite behind the president if he ends up circumventing Congress to build the wall.“I don't take anything off the table. I don't like to take things off the table. It's that alternative. It's national emergency, it's other things and you know there have been plenty national emergencies called. And this really is an invasion of our country by human traffickers,” Trump told CBS, asked if he would shut down the government.