http://www.cbc.ca/news/world/donald-trump-uk-us-crown-queen-1.3990696Mr. Trump goes to London, and preceding him are protests, a debate over petitions on the matter in the House of Commons, a motion by a Conservative MP to sack to the Speaker of the House of Commons, and warnings that his visit could require having thousands of police officers on the streets.
EDIT:
Trump is far from the first controversial head of state to be received by the Queen.
https://en.wikipedia.org/wiki/List_of_state_visits_received_by_Queen_Elizabeth_IIAmong controversial leaders preceding him:
Haile Salassie I of Ethiopia
President Francisco Craveiro Lopes of Portugal, the second President during Salazar's rule as Prime Minister
Shah Mohammad Reza Pahlavi of Iran, after Mossaddegh was kicked out by the CIA at MI6's behest
Various Kings of Saudi Arabia
President Nicolae Ceaucescu of Romania
President Suharto of Indonesia
President Hosni Mubarak of Egypt
President Robert Mugabe of Zimbabwe
Various Presidents of China
President Vladimir Putin of Russia
President Park Geun-hye of South Korea
President Michael Higgins of Ireland