White House warns Trump: Don't attack Michelle Obama
© Greg Nash

The White House is warning Donald TrumpDonald John TrumpTrump rips Dems' demands, impeachment talk: 'Witch Hunt continues!' Nevada Senate passes bill that would give Electoral College votes to winner of national popular vote The Hill's Morning Report - Pelosi remains firm despite new impeachment push MORE to not attack first lady Michelle ObamaMichelle LeVaughn Robinson ObamaMichelle Obama to headline Essence Festival Obama shares tribute to Michelle to celebrate Mother's Day 111-year-old woman gets free tickets to see Michelle Obama book tour 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 ClintonHillary Diane Rodham ClintonNevada Senate passes bill that would give Electoral College votes to winner of national popular vote 2020 Dems break political taboos by endorsing litmus tests Iowa Democrats brace for caucus turnout surge 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.