Notably

"Please Mr. President, stop."
Former GOP Sen. @RickSantorum chastises Pres. Trump for promoting his club in Florida as a possible venue for the next G7, adding he thinks Trump is a "promoter and that's... just who he is and it's inappropriate. He shouldn't do it." pic.twitter.com/lbGu4uPWin

— Anderson Cooper 360° (@AC360) August 27, 2019

Rpick Santorum is not a sitting GOP member of Congress.