I have a friend who is a retired USAF dentist and despises (in a literal definition of the word sense) the current POTUS. He's written some pretty scathing e-mails to the White House and once stated that the POTUS - because of his fiscal policies - had reason to fear for his security among working Americans. He received a visit once about four months ago at his practice by a pair of agents looking (he surmises) to gauge his general mental state after mentioning the POTUS's safety. He says they stayed about twenty minutes, were very polite, thanked him for taking his time and left. They gave him no warnings, advice, etc., and he hasn't heard from them since. He still sends e-mails to the White House and Congress when he's seriously upset over a policy decision.
The White House gets a lot of mail - both traditional and electronic, laudatory and uncomplimentary. It takes some pretty serious verbiage to garner the type of attention and reaction this British college student received.
And IMO the lame a$$ alcohol excuse this kid is using holds water like a collander.
Richard's $.02