The Clinton campaign countered by sending President Obama to Ann Arbor.
He urged voters not to believe Trump when he says he's looking out for the middle class.
"Manufacturing jobs have grown at the fastest rate since the 90s, when another Clinton was President. I think we've earned some credibility here. So what'd I tell ya? That Donald Trump is not the guy who's gonna look out for you. You need to listen. Do not be bamboozled," said President Obama.