[Marine Inspector]

The US Constitution does not prohibit identity checks for supposed US citizens entering the USA.

Too bad this was not an identity check.

[FreeReign]

Too bad this was not an identity check.

This was an identity check.

Daily News: "We understand that most of these conferences are legitimate, but it is our duty, it is incumbent on us to verify the identity of everybody entering the U.S. - even citizens," said Kristi Clemens, a Washington spokeswoman.