The White House is warning Donald Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE to not attack first lady Michelle Obama Michelle LeVaughn Robinson ObamaMichelle Obama: 'Don't listen to people who will say that somehow voting is rigged' Michelle Obama and Jennifer Lopez exchange Ginsburg memories Social media platforms put muscle into National Voter Registration Day MORE unless he wants to lose even more support.

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“I can’t think of a bolder way for Donald Trump to lose even more standing than he already has than by engaging the first lady of the United States,” principal deputy White House press secretary Eric Schultz told reporters aboard Air Force One on Thursday.

Obama tore into Trump's comments and alleged behavior toward women during a Thursday campaign event for Hillary Clinton Hillary Diane Rodham ClintonButtigieg stands in as Pence for Harris's debate practice Senate GOP sees early Supreme Court vote as political booster shot Poll: 51 percent of voters want to abolish the electoral college MORE in New Hampshire.

“I can't believe I'm saying that a candidate for president of the United States has bragged about sexually assaulting women,” a visibly emotional Obama said.

Trump did not mention the first lady in his own Thursday campaign event, which began moments after Obama's wrapped up.

Trump has steered clear of criticizing the first lady, sometimes complimenting her instead.

When she slammed the Republican nominee in her prime-time speech at the Democratic National Convention in July, Trump said after that she “did a very good job.”

“I liked her speech.”

The first lady has a 64 percent approval rating, a Gallup poll found in August — well above both Trump and Clinton, as well as nearly every major player in politics.