President Joe Biden and First Lady Jill Biden welcomed NATO dignitaries to the white house for a social dinner in Washington on Wednesday. Biden is hosting world leaders in Washington for the NATO summit this week with a crowded schedule of formal meetings, sideline chats and long diplomatic dinners, all opportunities to showcase he is up to the job despite a worrisome performance last month in the first presidential debate with Trump. His imperilled reelection campaign hit new trouble Wednesday as House Speaker emerita Nancy Pelosi said merely “it’s up to the president to decide” if he should…