One of the many known unknowns, however, of a Trump state visit is what kind of Trump will show up when a microphone is placed in front of him. The US president is often a bundle of contradictions. During his first state visit in 2018 most UK diplomats said he was a picture of affability, yet he took it upon himself to conduct an interview with the Sun in which he insulted Theresa May, and said Boris Johnson would make a great prime minister.