Donald Trump's unconventional approach is a worry for London. Donald Trump to make ‘dummy run’ visit to UK: report There are concerns that a full state visit could be a disaster because of the US president’s unorthodox approach.

The U.K. government invited U.S. President Donald Trump for talks with Prime Minister Theresa May in a “dummy run” ahead of an official visit, the Daily Mail reported.

Trump will be offered a state visit next year, but only if his low-profile trip is a success, the newspaper said.

The dummy visit is in response to concerns that Trump’s visit could be a disaster and his unorthodox approach to protocol — or his eccentric behavior — could embarrass the Queen.

May from her side wants to avoid upsetting Trump as she is keen to broker a good post-Brexit trade deal with the U.S. His visit is likely to trigger demonstrations.

London Mayor Sadiq Khan last week called for plans for a Trump state visit to be scrapped altogether, the Sun reported. "State visits are different from normal visits and, at a time when Trump has many policies that many in Britain disagree with, I’m not sure it is appropriate to roll out the red carpet," Kahn said.