Under standard protocol, the Justice Department is supposed to get formal approval from the U.K. before meeting with British citizens in the U.K. In this case, the Justice Department requested to meet with Mr. Hayes, laying out the planned criminal case against him.

WSJ: U.S. and U.K. in Tussle Over Trader

The gifts were reported in an annual filing by the US state department's protocol office.

BBC: China tea set and brooch among royals' gifts to Obamas

And you're also going to hear about the importance of protocol from Tanya Turner, who is a protocol officer from the State Department.

WHITEHOUSE: First Lady Michelle Obama Discusses State and Official Visits | The White House