Apart from the meeting with UK Prime Minister Theresa May, Trump met with local business leaders, including Barclays CEO Jes Staley, GlaxoSmithKline chief executive Emma Walmsley, BAE Systems chairman Sir Roger Carr, and the National Grid's John Pettigrew.
At the same time, London is hosting an anti-Trump protest, with thousands expected to take part in the rallies.
READ MORE: Corbyn to Join London Rally Against Trump's UK Visit