Article continues below advertisementDonald Trump was slammed as a liar by Melania Trump's former chief of staff. The president 79, claimed he was completely unaware that the first lady was going to give a televised address denying her alleged ties to late predator Jeffrey Epstein on Thursday, April 9."I'm going to say, I call B- on our president saying he knew nothing about it, because at the very least, I imagine she would have given him a heads up if she had sent an advisory out yesterday," Stephanie Grisham said during CNN's The Lead on Thursday.