President Joe Biden is laughing off Donald Trump’s latest rants. On Monday, August 19, shortly before the Democratic National Convention was scheduled to begin, CNN’s Kaitlan Collins asked the the president for his thoughts on Trump’s allegations that Democrats had staged a “vicious coup” to oust him from the White House. “Donald Trump claims that you were pushed out from the top of the ticket … What do you make of those claims?” she asked. Biden cracked a smile as he quipped, “His stability is still questionable.” This comes hours after Trump, 78, went on a series of rants in which he repea…