With apologies to another poster:

Ring, ring, ring
( BT picks up)
JT :  Hi, who's this?
BT: Barron Trump....who's this?
JT:  It's Justin Trudeau, the Prime Minister of Canada.  Say, I need to talk to your dad about the NAFTA deal.  It's real important...can you get him for me please Barron?
BT: Actually, that's Mr. Trump to you, Justin.....