 With some senior diplomats saying they attract a noticeable deterioration in the president's faculties in meetings since last summer. There are real doubts about how Biden could successfully manage a second term. But one senior European diplomat said U.S. administration officials in private discussions denied there was any problem. The White House disputed the characterization that Biden has stumbled on the world stage. National Security Council spokeswoman Adrienne Watson said foreign leaders see Joe Biden up close and personal. They know who they're dealing with, how effective he has been, how important his leadership is.