President Trump warned that Republicans who choose to defy him on his immigration-emergency declaration are taking a big risk, according to Sen. Lindsey Graham, who met with the president Tuesday.

“He says he thinks Republicans are playing with fire here because most Republicans, anyway, most people I hope, will see that the border is in a state of crisis,” Graham (R-SC) told Politico. “That’s his observation, but he’s not out there calling people out or anything.”

A Senate vote before the March 15 recess is poised to deliver Trump a rare rebuke from the GOP-controlled chamber.

At least four Republicans say they will join Democrats to approve a measure overturning Trump’s national emergency declaration at the southern border.

They are Rand Paul (Ky.), Susan Collins (Maine), Thom Tillis (NC) and Lisa Ann Murkowski (Alaska).

Trump has vowed to veto the vote if it doesn’t go his way.