Trump’s Grip Shows Signs of Slipping as Senate Prepares to Block Wall Emergency

Senator Mitch McConnell, the majority leader, conceded on Monday that he could not stave off final passage of a resolution overturning President Trump’s national emergency declaration, setting up a rebuke to Mr. Trump amid signs that the president’s grip even on his own party in Congress may be slipping.

With Senator Rand Paul of Kentucky joining three other Republicans — Susan Collins of Maine, Lisa Murkowski of Alaska and Thom Tillis of North Carolina — in announcing he would support the measure, Democrats now have the 51 votes they need to secure passage and to force Mr. Trump to issue the first veto of his presidency.