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

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

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.

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.

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

Former President Barack Obama arrived at the U.S. Capitol on Monday for President-elect Trump’s inauguration ceremony without former First Lady Michelle Obama.

The men who held the nation’s highest office before President Trump have all remained mum on his taking the presidency on Monday.

Donald Trump will be sworn in for a second term as president Monday—with every living former president, billionaires like Elon Musk and Mark Zuckerberg, Carrie Underwood, the Village People and several foreign leaders getting invitations.

He is one of only three US presidents never to have had any presidential pets. When he assumed office in 2016, he was the first in 100 years not to have pets in the White House, with only James K. Polk and Andrew Johnson abstaining before then.