UK considered setting up warning system over Trump's unexpected announcements

A majority of the released emails included exchanges between the British Embassy, Washington DC, and the Foreign Office after Trump signed his travel ban executive order.

The January order temporarily banned citizens of seven predominantly-Muslim countries and ended all refugee admissions to the US.

The emails showed the Foreign Office's concerns that British citizens having dual nationality and traveling to America would be affected.

On January 30, senior Foreign Office official Kara Owen sent an email to colleagues, requesting the new warning system for Trump.

"Many of these [executive] orders will no doubt be issued just as London is going to sleep," she wrote.

"I would like us to establish a system for assessing the impact of the orders on UK interests (if any) and offering quick advice."

The emails indicate the UK Foreign Office's concerns about Trump's continued unexpected announcements and how they may impact Britain, said James Landale, the BBC's diplomatic correspondent.

This concern is also shared by US officials who too have been "at times equally blindsided by the president's early morning tweets," he adds.

The emails, however, don't indicate any deterioration in the UK's relations with the US.