On tonight's Nightcap: Trump welcomes Mamdani at the White House and Marjorie Taylor Greene says she's quitting Congress. Then, consumer sentiment falls to a 5-month low amid fears about high prices and affordability. Plus, Health Secretary RFK Jr. says he told the CDC to change its website's language on autism and vaccines. Jason Johnson, Joyce Vance, Justin Wolfers, and Ben Collins join The 11th Hour