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

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.

Obama did not want to be there. But she went because it was expected of her, even though it meant being in the presence of the man who tried to delegitimize her husband’s historic nomination and presidency.

Other former presidents and first ladies are expected to attend as are tech billionaires Elon Musk, Mark Zuckerberg and Jeff Bezos.

The inauguration is the second gathering of U.S. presidents and their spouses that Michelle Obama has missed in recent weeks.

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

Michelle Obama was the only spouse absent from the service last week at Washington National Cathedral, where her husband and Trump were seated next to each other and chatted and laughed like old friends despite the history of political animosity between the Democratic former president and the returning Republican.

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.

Former first lady Michelle Obama will not attend President-elect Donald Trump's inauguration on Monday, Jan. 20.“Former President Barack Obama is confirmed to attend the 60th Inaugural Ceremonies,

Former first lady Michelle Obama will not attend Donald Trump’s inauguration next week, her office said Tuesday, without providing an explanation for her decision.