Obama, a self-professed Olympics fan, has followed the games over the last two weeks, tweeting at athletes and praising them in one of his weekly addresses. 

On Sunday, he tweeted at the U.S. basketball teams, both of which won gold medals in the games. "Congrats to the U.S. women’s and men's basketball teams for bringing home the gold. You all make us so proud. -bo," his tweet read.

In the Aug. 4 address, Obama told America’s Olympians competing in London that "your country could not be prouder of you."

He said their efforts showed that "for all our differences, we’re Americans first" and thanked them for helping bring “us all together this week.”

While the president did not attend the games in London, first lady Michelle ObamaMichelle LeVaughn Robinson ObamaMelania Trump to attend Barbara Bush's funeral The Hill says goodbye to 50 Most Beautiful Family, friends mourn death of Barbara Bush MORE visited the United Kingdom to attend the opening ceremonies and meet with the American team.

She watched American Serena Williams win a first-round match at Wimbledon's Centre Court, cheered on Americans Ryan Lochte and Michael Phelps in the 400-meter medley and watched the U.S. Dream Team in basketball.

GOP presidential candidate Mitt Romney, who also served as the CEO of the 2002 Salt Lake City Olympics organizing committee, also attended the opening ceremonies and his wife watched the dressage competition, where their 15-year old mare, Rafalca, was performing. 

Romney, who visited the U.K. on his three-nation foreign tour, attracted criticism after questioning whether the country was ready to host the games, remarks which were rebuked by Cameron and London Mayor Boris Johnson.