Barack Obama, Hillary Clinton and Bernie Sanders weren't too subtle about disguising their feelings at Donald Trump's inauguration.

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.

Clinton was caught on camera snickering as Trump vowed to change "the name of the Gulf of Mexico to the Gulf of America."

Bill and Hillary Clinton were less than impressed by Donald Trump’s inaugural speech, a fact which they made clear with subtle snark. The address that followed Trump’s swearing-in on Monday was tinged with vindication.

Former President Bill Clinton and former Secretary of State Hillary Clinton arrive ahead of Trump's second inauguration ceremony.

Trump spoke about his plan to change the name of the Gulf of Mexico to the "Gulf of America." 🎬 SIGN UP for Parade's Daily newsletter to get t

Former Secretary of State Hillary Clinton couldn't help but laugh when Donald Trump said that he was signing an executive order to rename the Gulf of Mexico to the Gulf of America. Trump made the vow during his inaugural address inside the Capitol on Monday.