Ex-White House doctor, Rep. Ronny Jackson (R-Tx.), is demanding that President Joe Biden take a cognitive test or drop out of his newly announced 2024 race altogether. Jackson, who has repeatedly questioned whether the 80-year-old president has the cognitive ability to be commander-in-chief, renewed calls for a mental evaluation as Biden announced Tuesday he was seeking re-election. The Republican made the demands in a letter, obtained by The Post, which is currently being circulated among House Republicans in a bid to garner support before it is sent to Biden. “We call on you to either resign immediately and renounce your...