Neil Young expressed his concerns about President Donald Trump preventing him from returning to America following his European tour. Born in Canada, the 79-year-old, a dual U.S. and Canadian citizen, has been an outspoken critic of Trump, calling him the worst president in the history. With his first European tour in six years just over two months away, the rocker fears Trump might bar him from returning, or even put him 'in jail. “When I go to play music in Europe, if I talk about Donald J. Trump, I may be one of those returning to America who is barred or put in jail to sleep on a cement floor with an aluminum blanket,” he wrote on his website on Tuesday. He continued: “That is happening all the time now. Countries have new advice for those returning to America. You can read about it at the CANADA Desk. If I come back from Europe and am barred, can’t play my USA tour, all of the folks who bought tickets will not be able to come to a concert by me.” “That’s right folks, if you say anything bad about Trump or his administration, you may be barred from re-entering USA,” he went on. “If you are Canadian. If you are a dual citizen like me, who knows? We’ll all find that out together.”