The extremist Republican Marjorie Taylor Greene â€œmight be a Democrat â€“ or just an idiotâ€ â€“ according to a fellow hardline conservative.
Dan Crenshaw, a Texas congressman and former Navy Seal, threw the barb back at the Georgia congresswoman in a spat over his support for using the Federal Emergency Management Agency (Fema) to operate Covid testing sites.
The US is experiencing a crippling surge of Covid cases thanks to the infectious Omicron variant, with more than 1m recorded on Monday and lack of access to testing hampering state and federal responses.
Greene has consistently spread Covid conspiracy theories. On Sunday, she was permanently suspended from Twitter, for spreading misinformation.
The only politician ever to beat Barack Obama will retire from Congress at the end of the year.
Bobby Rush, a Democratic representative from Illinois, faced Obama in a House primary in 2000 â€“ and beat him by more than 30 points. Obama went on to win a US Senate seat in 2004 and become the first Black president in 2009.
Rush, 75 and first elected to Congress in 1992, is an ordained minister and social activist who co-founded the Illinois Black Panther Party and was described by Politico on Monday as â€œa legend in Chicago politicsâ€.
In a video obtained by the Associated Press, he said: â€œI have been reassigned. Actually, Iâ€™m not retiring, Iâ€™m returning home. Iâ€™m returning to my church. Iâ€™m returning to my family. I have grandchildren. Iâ€™m returning to my passion.
â€œI will be in public life. I will be working hand in hand with someone who will replace me.â€
Rushâ€™s district is solidly Democratic but political rune-readers still found worrying signs for the national party.
Rush is the 24th Democrat to announce that they will not run in 2022. Only 11 Republicans have said the same.