US won't send officials (diplomats) to Beijing Olympics
... because, it says, of China's genocide (Uighurs not Tibetans), crimes against humanity, and other human rights abuses.
Support came from both sides of the Congressional isle.
US Athletes are still going.
In 1980, US officials AND athletes weren't allowed to go to the Moscow Summer Games, due to, the US said, the Soviet invasion of Afghanistan. Russia refused to come to the Summer Games in the US in 1984.