A No 10 spokesperson said:
The Prime Minister attended a part of the National Security Adviser’s meeting with the US Secretary of State Rex Tillerson at 10 Downing Street today.
They discussed the continuing depth and breadth of the special relationship.
They agreed on the importance of the international community coming together to counter Iran’s destabilising regional activity, and the Prime Minister reiterated the UK’s commitment to the Iran nuclear deal.
Link: Press release: PM meeting with US Secretary of State Rex Tillerson: 22 January 2018
Source: Gov Press Releases