Theresa May is expected to seek a special free trade deal during her trip to the US on Friday. The Prime Minister will be the first foreign leader to meet Mr Trump, and will later address the annual congressional Republican Retreat in Philadelphia. Sir Vince Cable, the former Lib Dem MP and business secretary, said on Twitter today that it's an "Appalling error by May to grovel to Trump for trade deal. He wants to destroy free trade". He joined Share Radio's Ed Bowsher to discuss.