 Coming up in this extended edition of The Newsroom, President Biden is due to start a news conference within the next half hour or so at the NATO summit in Washington. But it won't be the international diplomacy people are pouring over. Instead, it will be his performance as the number of prominent Democrats calling on him not to seek re-election grows. Is this a make or break moment for him and his supporters? If he fails the test, could we see another Democrat going up against Donald Trump in November's election?