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.

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

Former Vice President Mike Pence is in attendance at Trump’s inauguration, his wife, former second lady Karen, is not. Karen Pence snubbed the Trumps earlier this month at Carter’s funeral, where she ignored Melania Trump’s efforts to shake her hand.

According to NBC News, the Obamas, Clintons and Bushes won't be at the traditional lunch that follows Trump's swearing-in.