The upcoming state visit by Donald Trump is not the first time a trip by a world leader to the UK has been marked by controversy.
Downing Street insists the visit will go ahead, despite worldwide outrage over Mr Trump's 90-day travel ban on people from seven mainly Muslim countries including Iran, Iraq, Libya, Somalia, Sudan, Syria and Yemen.
He will be the third US president, after Barack Obama and George W Bush, to be invited to enjoy the pomp and ceremony that comes with such an exclusive invitation by Queen Elizabeth II.
But as a petition calling for Mr Trump not to meet the Queen during his visit passes one million signatures, here's a look at a few previous state visits that have been dogged by protests:
7. Romania's Nicolae Ceausescu - 13-16 June, 1978
It was the first state visit by a Communist head of state to the UK and Romania was already well-known as one of the most corrupt and oppressive of the Soviet Union's Cold War satellite states. At the time, the Queen took drastic steps to avoid meeting the dictator, according to royal author Robert Hardman. "While walking her dogs in the Palace gardens, she spotted Ceausescu and his wife Elena heading in her direction. As the Queen told a lunch guest some years later, she decided the best course of action was to hide behind a bush rather than conduct polite conversation," he wrote. The Romanian leader was honoured by the government during his visit in an attempt to improve relations within Europe during the Cold War. However, his knighthood was revoked shortly after he was deposed in 1989.
