Donald Trump has said he has “to be careful” when he walks in a rare health admission. Speaking to CNBC’s Joe Kernen via phone call on Tuesday (21 April), the president, 79, took aim at his predecessor Joe Biden, saying he “couldn’t walk up a flight of stairs” and was “falling all over the place”. Reflecting on his own walking, Trump added: “I have to be careful, 'cause if I do trip or fall, it's gonna be the biggest… and this is why when I get out of those planes I walk nice and slowly, I'm not looking to set any speed records.”