LONDON, March 20, 2019 (Xinhua) -- An anti-Brexit protester holds a European Union flag outside the Houses of Parliament in London, Britain, on March 19, 2019. Downing Street confirmed Tuesday that British Prime Minister Theresa May will write to European Council President Donald Tusk asking for Britains departure from the bloc to be delayed.

LONDON, March 20, 2019 (Xinhua) -- Queen Elizabeth II (L) and Catherine, the Duchess of Cambridge, visit Kings College London to officially open Bush House, a newly converted suite of lecture theaters and teaching rooms at the university, in London, Britain, on March 19, 2019.

LONDON, March 20, 2019 (Xinhua) -- A demonstrator holds a placard outside the Houses of Parliament in London, Britain, on March 19, 2019. Downing Street confirmed Tuesday that British Prime Minister Theresa May will write to European Council President Donald Tusk asking for Britains departure from the bloc to be delayed.