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.

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 ...

From left, former President Bill Clinton, former Secretary of State Hillary Clinton, former President George W. Bush, former first lady Laura Bush, and former President Barack Obama arrive before ...

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.

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

“CBS Mornings” co-host Gayle King, in her live coverage of the inauguration of President Donald Trump, said: “I have to say, I’m looking at this crowd, I do not see many people of color. Does any — does anybody else besides me observe that? I’m fascinated by why that is.”