Sen. Bob Corker (R-Tenn.), nearing the end of his time in the Senate after his decision to retire, was mum on whether or not he'd support a primary challenge against President Trump in 2020 during an interview on MSNBC's "Kasie DC," saying instead, "We've got to remember what the Republican Party is." He added, "What is happening right now is not the standard Republicanism that we've had in our country for many, many years."

Flashback: Corker got into a verbal sparring match with Trump in October 2017, calling the White House "an adult day care center" after Trump blasted him on Twitter for deciding not to seek re-election after asking for the president's endorsement.