Boosts primary challenger to GOP Sen. Jeff Flake, calling him "toxic"

Trump used his Twitter account to endorse the primary challenge of Kelli Ward against sitting Republican Senator Jeff Flake of Arizona, calling Flake "WEAK on borders, crime and a non-factor in Senate" and declaring "He's toxic!" Flake, who had publicly criticized Trump, faced a 2018 re-election; Trump's intervention marked an unusually direct presidential effort to defeat a senator of his own party for insufficient loyalty. Commentators described the attack as part of a pattern of grudge-driven retaliation against Republicans who declined to fall in line. Flake announced two months later that he would not seek re-election, citing the direction of the party under Trump.

"Great to see that Dr. Kelli Ward is running against Flake, who is WEAK on borders, crime and a non-factor in Senate. He's toxic!" Quote verified against source