Senate Republicans are warning President TrumpDonald John TrumpTrump cites tax cuts over judges as having biggest impact of his presidency Trump cites tax cuts over judges as having biggest impact of his presidency Ocasio-Cortez claps back at Trump after he cites her in tweet rejecting impeachment MORE ahead of his State of the Union speech against using a national emergency declaration to build the U.S.-Mexico border wall. 

GOP lawmakers warned that declaring a national emergency would be met with resistance on Capitol Hill, where Congress could try to block Trump by using a resolution of disapproval. 
 
Sen. John ThuneJohn Randolph ThuneNew push to regulate self-driving cars faces tough road Trump's border funding comes back from the dead Public policy expert: US has become 'outlier' on immigration practices MORE (R-S.D.), the No. 2 Senate Republican, said that he and "a lot of my colleagues" have concerns about the precedent Trump would set if he declared a national emergency to construct the border wall. 
 
"There's a lot of reservations in the conference about it and I hope they don't go down that path," Thune told reporters. 
 
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Sen. John CornynJohn CornynTrump puts GOP in tough spot with remarks on foreign 'dirt' Trump puts GOP in tough spot with remarks on foreign 'dirt' Overnight Health Care: Pelosi to change drug-pricing plan after complaints | 2020 Democrats to attend Planned Parenthood abortion forum | House holds first major 'Medicare for All' hearing MORE (R-Texas), who is close to Senate Majority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellGOP nervous that border wall fight could prompt year-end shutdown GOP nervous that border wall fight could prompt year-end shutdown Jon Stewart slams McConnell over 9/11 victim fund MORE (R-Ky.), told reporters that declaring a national emergency would be a "dangerous step" that likely wouldn't allow Trump to build the wall border wall because it would get bogged down in court and challenged in Congress. 
 
Congress has until Feb. 15 to get a deal on funding for the border wall and to prevent a second shutdown, which would impact roughly a quarter of the government. The president is demanding $5.7 billion for the wall; Democrats have rejected money for a concrete wall but signaled some openness to fencing or other barriers. 
 
 
"I wouldn't prefer one. I believe we should continue to work toward the legislative solution," he said. "I do believe that the president's probably got the power under the Constitution and maybe under the statue to do that, but I would rather us do it." 
 
Trump has refused to rule out declaring a national emergency if Congress isn't able to reach a deal on wall funding, despite public pushback from Republicans including McConnell. 
 
He hinted to reporters on Friday that they should "listen closely" to his State of the Union speech.
 
“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,” Trump separately told CBS News's "Face the Nation" when asked if he would shut down the government. 
 
 
Democrats would likely be able to pass the resolution easily through the House and kick the fight to the Senate, where Schumer would be able to force a vote. 
 
McConnell reportedly warned Trump that a resolution blocking his emergency declaration would be able to get enough GOP votes to pass, forcing the president to issue his first veto. 
 
Sen. Susan CollinsSusan Margaret CollinsDemocrats' 2020 Achilles's heel: The Senate Democrats' 2020 Achilles's heel: The Senate The Hill's Morning Report — Uproar after Trump's defense of foreign dirt on candidates MORE (R-Maine), while caveating that she doesn't know what Trump is going to, said she is "in general opposed to the president using the National Emergencies Act." 
 
"I don't think the intent was for it to be used in this kind of situation. And as a member of the Senate I'm very concerned if the president believes that he can reallocate or repurpose appropriations for which we have designated very specific purposes," she said. 
 
"It also is in my judgement of dubious constitutionality," Collins added. "So I don't really think it gets him to the goal."  
 
 
Republicans have tried to stick closely to Trump during the months-long fight over the border wall, which remains a potent issue among the party's base. But there have been growing fractures about shutdown strategy after GOP senators became increasingly anxious during the 35-day partial funding lapse. 
 
Trump would likely have some GOP support if he declared a national emergency. 
 
Sen. John KennedyJohn Neely KennedyMORE (R-La.) has repeatedly told reporters that he doesn't think it would "be the end of Western civilization," while also saying last week that he didn't know how he would vote on an effort to block the declaration. 
 
Sen. Lindsey GrahamLindsey Olin GrahamTrump wishes 'Happy Father's Day to all,' including 'worst and most vicious critics' Trump wishes 'Happy Father's Day to all,' including 'worst and most vicious critics' Election security bills face GOP buzzsaw MORE (R-S.C.) acknowledged that Trump circumventing Congress on the wall fight divides Republicans, but urged his colleagues to line up behind the president. 

"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.

He added that "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."