Michelle Obama, campaigning for Hillary Clinton, unleashed a barrage of attacks on Donald Trump on Wednesday, calling the Republican nominee “erratic and threatening.”

The first lady — who famously said in her convention speech this summer that when Republicans “go low, we go high” — portrayed Trump as a monster during a Philadelphia, Pennsylvania campaign rally.

[dcquiz] “If a candidate is erratic and threatening; if a candidate traffics in prejudice, fears and lies on the campaign trail; if a candidate thinks that not paying taxes makes you smart; or that it’s good business when people lose their homes; if a candidate regularly and flippantly makes cruel and insulting comments about women, about how we look and how we act, well, sadly, that’s who that candidate really is,” she said.

Continuing, Michelle Obama said: “That is the kind of president they will be. And trust me, a candidate is not going to suddenly change once they’re in office. Just the opposite, in fact. Because the minute that individual takes that oath, they are under the hottest, harshest light there is; and there’s no way to hide who they really are.”

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