During a portion of an interview with BET News set to air on Wednesday that was aired on Tuesday's broadcast of "CBS Evening News," President Joe Biden said he'd leave the race "if the doctors came to me and said, you've got this problem and that problem." And that he originally planned to be a transitional candidate and "pass it on to someone else. But I didn't anticipate things getting so, so, so divided." And "there's more to do, and I'm reluctant to walk away from that."