They are foreign intelligence operatives and should be treated as such

the agency's Homeland Security Investigations branch work with Canadian partners on joint investigations involving narcotics, weapons smuggling and human trafficking.

“HSI special agents do not conduct operational activities in Canada, such as making arrests or executing search warrants," the spokesperson said.

Trump trying to flex his power

"Protecting" the US athletes, I assume. Y'know, like how North Korea protects its athletes when they go abroad and are exposed to horrible foreign thoughts.