New York City mayoral frontrunner Zohran Mamdani was hosted by fellow socialist Rep. Alexandria Ocasio-Cortez in Washington DC Wednesday — as he tries to rally support from Democrats after his stunning primary win set off an “earthquake” in the party.

A top aide to former first lady Jill Biden refused to answer GOP investigators' questions on Wednesday as the House Oversight Committee probes whether senior ex-White House aides covered up signs of former President Joe Biden's mental decline.