Rebel members of President Donald Trump’s celebration have helped pass a vote to reject his declaration of an emergency on the US-Mexico border.
Twelve Republican Senators broke celebration lines to side with Democrats, passing a proposal to revoke the declaration by 59-41.
The Democratic-controlled Property of Representatives final month backed the measure.
Mr Trump earlier acknowledged he would “possibly” have to veto the resolution.
Congress wants a two-thirds majority of each chambers to override a presidential veto, which is viewed as unlikely in this case.
Nonetheless, the defeat will be noticed as an embarrassing loss for the president on his signature domestic problem.
It comes just a day soon after the Senate rebuked him on foreign policy by approving a bill to finish US assistance for the Saudi-led coalition in Yemen.
The Republican rebels on Thursday had been Mitt Romney and Mike Lee of Utah, Marco Rubio of Florida, Roy Blunt of Missouri, Lamar Alexander of Tennessee, Pat Toomey of Pennsylvania, Rob Portman of Ohio, Jerry Moran of Kansas, Susan Collins of Maine, Lisa Murkowski of Alaska, Rand Paul of Kentucky, and Roger Wicker of Mississippi.
Thom Tillis of North Carolina changed his thoughts minutes ahead of the vote and mentioned he would oppose it.
The Republican president declared the emergency on 15 February soon after Congress refused funding for a wall on the US-Mexico border, a crucial campaign pledge.
He aims to circumvent Congress and construct his lengthy-promised barrier by raiding military budgets.
It could totally free up virtually $8bn (£6bn) for the wall, which is nonetheless significantly quick of the estimated $23bn price of a barrier along virtually two,000 miles (three,200km) of border, but far extra than the almost $1.4bn begrudgingly allotted final month by Congress.
Earlier on Thursday Mr Trump known as Democrats “border deniers” and mentioned any Republican opposing him would be casting “a vote for Nancy Pelosi”.
He says the barrier is necessary to combat illegal immigration on the southern border which he has described as a “crisis”.
Democrats say the declaration is unconstitutional, Mr Trump has manufactured the border emergency and a wall would be a boondoggle.
The resolution to revoke the declaration passed the Property by a margin of 245-182 in February. Thirteen Republicans sided with Democrats.
Lawmakers employed a provision from the National Emergencies Act to overrule the president.
Most Republicans supported Mr Trump’s selection and accused Democrats of ignoring an emergency at the border.
Senate Majority Leader Mitch McConnell says the declaration is “the predictable and understandable consequences of Democrats’ selection to place partisan obstruction ahead of the national interest”.