The stirrings of possible rebellion in the president's party have come as Trump has struggled with low poll numbers and perceptions that he isn't doing enough to address affordability.
Ms. Greene's resignation blindsided her conservative Georgia district, which had stuck by her through ups and downs, including her split with the president.
President Donald Trump's Friday Oval office meeting with New York Mayor-elect Zohran Mamdani shocked many for its civility. They had traded insults and threats for months.