Donald Trump has slammed Sir Sadiq Khan in the latest twist in the pair’s decade-long feud.Speaking after his meeting with Nato chief Mark Rutte, the President told GB News Sir Sadiq was “grossly incompetent, a bad person, and a horrible representative for your country”.”You know that. That’s why you’re smiling and laughing… and it’s true. “But you know that the Mayor of London is a horror show. You have a crime problem. You have an immigration problem. “The immigration helps cause the crime, by the way, and you have a tremendous energy problem. You’re building stupid windmills all over the country, and they don’t do the job.”The President also repeated that Britain had one of the “greatest” oil fields in the North Sea – and gave his advice on how to best use the resource.He said: “All you have to do is bid it out to Exxon, Chevron, Shell, British Petroleum. They are begging to go there and pay billions of dollars.”And because the the left is so crazy, they don’t want the money… and the country is losing.”WATCH THE CLIP ABOVE FOR MORE