Prime Minister Loong invited to the White House

Donald Trump twitted about his meeting with Hsien Loong by calling him
Prime Minister Loong. For other Prime Minister or ministers to be
misunderstood is quite understandable. Didn’t Trump know that his famous
father is Prime Minister Yew? Oops, I mean Prime Minister Lee. And the
son cannot be Prime Minister Loong but Prime Minister Lee. Is Trump
another hillbilly?
 
Some Singaporeans tried