Putting Joey Barton on Twitter is like waiting for a time bomb to go off. He cannot keep his feeling to himself and one day his Twittering will get him in serious trouble. Barton will miss the club's pre-season trip to the United States after being denied a visa. The 28-year-old, who was given a six-month jail sentence after admitting assault and affray in 2008, has been denied the necessary permission to travel to the States on Sunday. After putting his views on the official NUFC website (obviously tailored to suit the media), he has been Tweeting . and the two stories are like chalk and cheese. Barton said in a statement on Newcastle's official website: "Unfortunately, I was denied my visa due to my past. "I regret not being able to travel with the club on this trip, but at the same time, I don't expect to be treated any differently or more favourably than anyone else in a similar situation. "All I can do is continue to improve as a person, which is what I intend to do. "Again, apologies to all the NUFC supporters - as well as the fast growing legions of football supporters in the United States who I was looking forward to meeting. I will see you in the future." Barton later wrote on Twitter that the decision was "hypocrisy". He tweeted: "Visa story is correct, they told me am not allowed in until I have 5yrs without any trouble. 3yrs down, 2yrs to go. "Totally hypocrisy considering what they get up to, but rules are rules."