 ABC News, I'm Michelle Franzen. The three-day NATO summit closing out with the alliance unified and stepping up aid to Ukraine to help defend against Russian attacks. President Biden playing host while he battles a campaign crisis. Next hour, the president holds his first press conference in months, defending his decision to stay in the race as Democratic concerns reach a fever pitch. Here's ABC's Stephen Portnoy. A source confirms the Biden campaign has begun doing its own internal head-to-head polling of a race pitting Kamala Harris against Donald Trump.