Trump's chief of staff warned the UK against Huawei ahead of meeting Boris Johnson's most important aide

· White House acting chief of staff Mick Mulvaney told members of the Oxford Union that the US is "very much concerned" about the UK's decision to allow Huawei to build parts of it's 5G network.
· Mulvaney's comments come one day before he's due to meet with Prime Minister Boris Johnson's top aide Dominic Cummings.
· The US...