Republican Sen. Lamar Alexander on Thursday asked President Trump to rescind his declaration of a national emergency at the border, just days before the Senate is expected to vote against Trump’s move.

“I want to make a respectful suggestion, and that is this: that President Trump ask his lawyers to take a second look at an existing funding authority that the president has to consider construction of the 234 miles of border wall that do not require a formal declaration of a national emergency,” Alexander, R-Tenn., said on the Senate floor.