US-UK trade deal 'more difficult' with a customs union

The US Ambassador to the UK says negotiating a trade deal post-Brexit would be 'much more difficult' if the UK is in a customs union with the EU. Woody Johnson also said it would be 'more challenging' for the UK 'to get control of [its] own trade policy'. But he said President Donald Trump is still hopeful doing a 'robust, big, very generous trade deal' with the UK after Brexit. President Trump will come to the UK for a state visit in June.