WASHINGTON — President Joe Biden took a swipe against Donald Trump’s supporters on Tuesday as he reacted to the Republican presidential nominee’s weekend rally at Madison Square Garden, which was overshadowed by crude and racist rhetoric. In a call organized by the Hispanic advocacy group Voto Latino, Biden responded to a comic at Trump’s rally who called Puerto Rico a “floating island of garbage.” Biden’s initial comments were garbled. [time-brightcove not-tgx=”true”] “Just the other day, a speaker at his rally called Puerto Rico a floating island of garbage.