Former Presidents Barack Obama, Bill Clinton and George W. Bush will come together again next week for the inauguration of President-elect Donald Trump, but one spouse, Michelle Obama, is sitting this one out.

Donald Trump shook hands with Mike Pence at Jimmy Carter's state funeral -- a notable exchange as the two men have not interacted publicly in years.

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.

Michelle Obama was not in attendance at former president Jimmy Carter's state funeral, so why did she miss the big event? Here's what we know.

Former first lady Michelle Obama will not attend President-elect Donald Trump's inauguration on Monday, her office confirmed to ABC News.

WASHINGTON, D.C. - Former President Jimmy Carter is being honored with a state funeral Thursday in Washington, D.C. All five living current and former presidents were in attendance, but only four first ladies. Former first lady Michelle Obama did not join her husband, former president Barack Obama, at the ceremony.

The handshake happened almost four years to the day when Trump supporters called for Pence's execution during the Jan. 6, 2021, Capitol attack.

Former first lady Michelle Obama did not attend the state ... Trump shook hands with his own former vice president, Mike Pence, who was a loyal ally until he refused to go along with Trump's ...

The president-elect and his former vice president, who have been at odds since the Jan. 6, 2021 Capitol riots, briefly conversed at former President Jimmy Carter's state funeral

That day Trump supporters stormed the U.S. Capitol, with some chanting "Hang Mike Pence ... Former first lady Michelle Obama did not attend the funeral. Pence did not endorse his former boss ...

Former first lady Michelle ... Obama appeared to be laughing at something Trump said. Other dignitaries did not react to the Trumps' arrival that way. Former second lady Karen Pence refused ...