US Secretary of State Mike Pompeo arrived in London on Wednesday for talks with British officials on the status of the relationship between the nations, amid heightened tensions over a nuclear deal with Iran and business agreements with Chinese tech company Huawei.
Mr Pompeo is scheduled to meet British Prime Minister Theresa May and Foreign Secretary Jeremy Hunt and deliver a speech on the potential for improved US-UK ties after Brexit. On his one-day visit, Mr Pompeo also took part in a round-table discussion on religious freedom chaired by the Archbishop of Canterbury.
The US Secretary of State arrived in the British capital after cancelling a trip to Germany to make an unannounced visit to Baghdad, where he warned Iraqi officials of imminent threats to American interests in the Middle East.
Mr Pompeo is expected to warn the UK about allowing Chinese firm Huawei access to critical infrastructure.
The US, which is the UK's leading intelligence partner, has said it will not give Huawei any 5G contracts, amid concerns it could be used to spy on the US.
Should Huawei be involved in building the UK's 5G mobile network and have access to critical data, the US may reduce its presence in the UK.