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.

Obama did not want to be there. But she went because it was expected of her, even though it meant being in the presence of the man who tried to delegitimize her husband’s historic nomination and presidency.

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

Former Presidents Barack Obama, Bill Clinton, and George W. Bush were not in attendance at President Donald Trump’s inaugural luncheon. Despite missing the luncheon, however, all three former presidents attended Trump’s swearing-in ceremony.

The inauguration was the second gathering of U.S. presidents and their spouses that Michelle Obama has missed in recent weeks.

Michelle Obama and Donald Trump have not exactly hidden their disdain for one another. Here's what we know about their ongoing feud.

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 Presidents Barack Obama, Bill Clinton and George W. Bush will not attend President-elect Donald Trump's traditional inaugural lunch.

Other former presidents and first ladies are expected to attend as are tech billionaires Elon Musk, Mark Zuckerberg and Jeff Bezos.

Second Lady Usha Vance is everything Vogue claims to champion. But the magazine has become all about naked partisanship and looks like a de-facto arm of the DNC.

Explore the iconic inaugural fashion of U.S. First Ladies, tracing styles from Mary Todd Lincoln's ball gowns to Melania Trump's bold choices, highlighting their impact on identity and diplomacy.