 Some experts are blaming the scorching heat that we've seen for the past few weeks for the uptick. It forces more of us indoors to conditions that are better for transmission. The CDC announced last month that new highly contagious yet less severe variants will prompt a new vaccine push in the coming months. Luke Lugar, WTOP News. We're learning more about the moments leading up to shots being fired at former President Trump at Saturday's campaign rally in Pennsylvania.