Rep. Joe Barton has a warning for President Donald Trump and the GOP: Brace yourselves.

The Texas Republican, who is retiring in January at the end of his 17th term, said the president is in for a “rude awakening” on Jan. 3, when the 116th Congress is sworn in and Democrats take back the House majority.

Trump will not be able to ward off a tsunami of investigatory oversight of his administration just by adopting a chummy tone with Nancy Pelosi, the presumed next speaker. That’s not how things go in Washington.

“Trump right now probably thinks he can say nice things about Nancy Pelosi … and the power of his personality and the art of the deal … can help get him want he wants,” Barton said in a wide-ranging interview with the Dallas Morning News. “That’s not going to work.”

The Democrats have developed a deep-seated resentment toward the president over everything from personal insults to policy feuds to what they see as a corrupt administration and 2016 campaign operation that has so far avoided any oversight or accountability from the GOP majorities in both congressional chambers.