Democratic front-runner Joe Biden struggled to recall the word "escalator" while bashing President Trump during a campaign stop in Miami, Florida. Speaking at at the historic Ball & Chain nightclub on Sunday afternoon to mark the start of Hispanic Heritage Month, Biden slammed the president's June 2015 comments about Mexican immigrants during his 2016 campaign announcement speech. "Remember when he came down, uh, down the, uh, down his escalator of Trump Tower?" Biden said after some prompting from the audience. "He announced on the way down, one of the reasons he was running was because of all those Mexican rapists."