While Donald Trump and Xi Jinping were hailing their friendship for the cameras, it was less amicable for the rival Chinese and U.S. security services.

From a standoff over a U.S. Secret Service agent's weapon to a U.S. staffer trampled during a melee, tensions bubbled to the surface throughout Trump's visit to Beijing.

The mutual distrust was underscored when U.S. officials made staffers and media, including an AFP reporter, boarding Air Force One hand over all badges and pins given to them by the Chinese side.