Pompeo tries to salvage a post-Brexit Britain alliance amid growing rift

US Secretary of State Mike Pompeo visits London on Wednesday to salvage a post-Brexit alliance with an old friend whose defiance on China and Iran underscores Washington's diplomatic isolation.

Prime Minister Boris Johnson has been touting the prospects of a big new trade deal with the United States that can fill the void of Britain's departure from the European Union on Friday.

But Pompeo's meetings with Foreign Secretary Dominic Raab and Johnson on Wednesday and Thursday threatens to become a damage limitation exercise for the "special relationship".

Pompeo had been doing his best to convince Johnson that allowing China's Huawei tech giant to