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.

WEST PALM BEACH, Fla. -- 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, but former Presidents Barack Obama, George W. Bush and Bill Clinton will be there.

Many were quick to notice Michelle Obama's absence on Inauguration Day, but the former first lady had a message to share on social media as questions over why didn't attend swirl.

A spokesperson for Pelosi, who attended Trump’s 2017 inauguration, did not provide an explanation for the move.

but former Presidents Barack Obama, George W. Bush and Bill Clinton will be there. Laura Bush and former Secretary of State Hillary Clinton will join their husbands for the Jan. 20 swearing-in ...

Former President Barack Obama arrived at the U.S. Capitol on ... Former Presidents Bill Clinton and George W. Bush arrived alongside their spouses, former Secretary of State Hillary Clinton ...

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.

Former President Bill Clinton was spotted at the inauguration of Donald Trump. See pictures of the former President here.

Bill Clinton, George W. Bush and Barack Obama have all arrived at the Capitol for President-elect Donald Trump's inauguration. Norah O'Donnell anchored CBS News' special report.

Barack Obama arrived without Michelle Obama at Donald Trump's inauguration on Monday, 20 January. The 44th president entered the US Capitol's Rotunda solo as he prepared to witness the Republican's swearing-in as the 47th commander-in-chief of the United States.