Joe Biden made the rounds on NBC's morning news shows to promote his new book, "Promise Me, Dad," about how he dealt with the loss of his 46-year-old son, Beau, to brain cancer in 2015. But the conversation on Megyn Kelly's morning show quickly turned to politics, President Donald Trump, and the possibility of Biden, who is 74, launching a 2020 presidential bid. "I honest to God haven't made up my mind about that,'' Biden told the "Today" hosts when asked about a 2020 run. "I'm not closing the door. I've been around too long." He added, "I'm a great respecter of fate, but who knows what the situation is going to be in a year and a half? I don't have any idea. I'm in good health now, I'm in good shape... but I just don't know. Honest to God, that's the truth."