One of the richest men in the world, Elon Musk is so all-in on Trump that he might start knocking on doors in Pennsylvania himself.

From setting up a "war room" in Pittsburgh to giving financial incentives for swing state voters from his super PAC, Elon Musk is relentlessly campaigning for Donald Trump in Pennsylvania.

After Trump introduced Musk to the stage, the tech mogul enthusiastically jumped in the air several times while supporters cheered. Musk, who wore a black Make America Great Again cap, warned in his speech that "this will be the last election" if the former president does not win in November while urging people to vote.