President Trump on Friday wrote that he was "withdrawing" his "support and Endorsement" of Rep. Marjorie Taylor Greene, indicating that he might even back an effort to primary his former longtime ally.

Former Rep. Adam Kinzinger, an outspoken critic of President Donald Trump, raised suspicions over MAGA firebrand Rep. Marjorie Taylor Greene’s (R-Ga.) feud between her and the president, claiming it’s...