Bill and Hillary Clinton Hillary Diane Rodham ClintonREAD: Cohen testimony alleges Trump knew Stone talked with WikiLeaks about DNC emails County GOP in Minnesota shares image comparing Sanders to Hitler Holder: 'Time to make the Electoral College a vestige of the past' MORE will attend President-elect Donald Trump Donald John TrumpREAD: Cohen testimony alleges Trump knew Stone talked with WikiLeaks about DNC emails Trump urges North Korea to denuclearize ahead of summit Venezuela's Maduro says he fears 'bad' people around Trump MORE's inauguration later this month, aides to the Clintons confirmed to The Hill on Tuesday.

Hillary Clinton, the 2016 Democratic presidential nominee, faced Trump in a brutal and contentious campaign, which culminated in a stunning Election Day upset for Trump, despite Clinton’s big edge in the polls and her victory in the popular vote.

New York magazine first reported the Clintons' plans.

Trump's battle with Clinton turned heated after they secured their parties' nominations.

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Trump repeatedly blasted the Clintons as corrupt, invited those who accused President Bill Clinton William (Bill) Jefferson ClintonKasich fundraises off 2020 speculation Inviting Kim Jong Un to Washington Howard Schultz must run as a Democrat for chance in 2020 MORE of sexual harassment or abuse to a debate, and called on Hillary Clinton to be sent to jail for her handling of classified emails while secretary of State.

Clinton, meanwhile, criticized Trump's conduct at many of her rallies.

She campaigned with a woman who had accused Trump of bullying her because of weight gain, highlighted allegations of sexual misconduct against him and characterized him as unfit for the office of the president.

While Clinton has made a handful of public appearances since the election, she has mostly stepped back from the public eye.

Trump and the Clintons had been friendly in the years before the election — the Clintons attended Trump's wedding to future first lady Melania Trump back in 2005, and President Clinton joined Trump at the 2000 U.S. Open tennis tournament in New York.

Their daughters, Chelsea Clinton and Ivanka Trump — Trump's elder daughter — have promised to continue their own friendship after the rough election.

The Clintons' announcement leaves President George H.W. Bush as the only living president who won’t attend, due to health reasons.

President George W. Bush earlier Tuesday said he would attend the inauguration, and President Jimmy Carter confirmed weeks ago that he would attend as well.

— This report was updated at 2:23 p.m.