Former Presidents Barack Obama, Bill Clinton and George W. Bush will not attend President-elect Donald Trump's traditional inaugural lunch.

As Barack, 63, Bill, 78, and Hillary, 77, entered the U.S. Capitol rotunda in Washington, D.C., on Monday for the 78-year-old’s historic swearing-in ceremony, people at the Capitol One Arena could be heard loudly booing.

Former President Barack Obama was spotted at the inauguration of Donald Trump. See pictures of the former president here.

Former first lady Michelle Obama will not attend the inauguration of President-elect Trump on Monday, the second time in two weeks that she will be absent from a significant event.

Bill Clinton will attend Trump's swearing-in ceremony ... Bush said he and former first lady Laura Bush are also attending. Michelle Obama was the only spouse absent at last week's funeral ...

Former first lady Michelle Obama will skip the inauguration of President-elect Donald Trump, the second time in two weeks that she is not attending a gathering of former U.S. leaders and their spouses,

Bill Clinton will attend the swearing-in ceremony ... Hillary Clinton will also attend, a spokesperson said. Michelle Obama was the only spouse absent from the service last week at Washington ...

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As Obama, Clinton, and Hillary, entered the US Capitol rotunda in Washington, D.C., for Trump’s historic swearing-in ceremony on Monday, loud boos echoed from the crowd at the Capitol One Arena

Along with former First Lady Michelle Obama, former House Speaker Nancy Pelosi will not attend Donald Trump's second inauguration on Monday. Published reports indicate that Chinese President Xi Jinping will send an envoy in his place, and that Hungarian Prime Minister Viktor Orban plans on skipping Trump's second inauguration.

The planned absence Monday follows another notable absence last week at the state funeral of former president Jimmy Carter.