Biden battles through high-stakes day and gaffes, explaining why he's still running

President Biden's high-stakes day included mistakes at a NATO speech and a press conference where he mistakenly called Ukrainian President Zelenskyy "Putin" and Vice-President Kamala Harris "Trump," but he brushed off the gaffes, touting his work re-igniting NATO and said his campaign network and funding positions him as the Democrat with the best chance to win in November.