 Growing calls for the head of the Secret Service to resign amid security lapses at the Trump rally at which the former president was almost assassinated. According to lawmakers briefed by the FBI, the Secret Service knew the shooter was on a roof nearby 20 minutes before he took his first shots. Lawmakers say the FBI has provided this timeline. That's ABC's Andrea Fujii. The White House also confirming that President Biden has COVID. Here's ABC Chief White House Correspondent Mary Bruce. The President...