Barton may be blocked from Newcastle preseason USA tour
The Mirror says Barton will have to convince United States immigration officials he is not a danger to the public before he can join Newcastle on their pre-season tour.
The midfielder will have to undergo an interview at the US Embassy in London to gain a visa for United's trip in July.
Barton served 74 days in prison after admitting assault and affray in an attack on a teenager outside McDonalds in Liverpool. He also has a four-month suspended sentence for ABH on former Manchester City teammate Ousmane Dabo.