British Prime Minister Theresa May (C) is seen during the Brexit deal vote in the House of Commons in London, Britain, on March 12, 2019. British Prime Minister Theresa May's Brexit deal was rejected again on Tuesday by MPs in the second meaningful vote in the parliament since January, increasing uncertainty about how the country will leave the European Union. (Photos: Xinhua)

British Chancellor of the Exchequer Philip Hammond (R) returns from the Brexit Deal vote in the House of Commons in London, Britain, on March 12, 2019. British Prime Minister Theresa May's Brexit deal was rejected again on Tuesday by MPs in the second meaningful vote in the parliament since January, increasing uncertainty about how the country will leave the European Union.

British Prime Minister Theresa May (C) is seen during the Brexit deal vote in the House of Commons in London, Britain, on March 12, 2019. British Prime Minister Theresa May's Brexit deal was rejected again on Tuesday by MPs in the second meaningful vote in the parliament since January, increasing uncertainty about how the country will leave the European Union.

Britain's Brexit Secretary Stephen Barclay (C) is seen during the Brexit deal vote in the House of Commons in London, Britain, on March 12, 2019. British Prime Minister Theresa May's Brexit deal was rejected again on Tuesday by MPs in the second meaningful vote in the parliament since January, increasing uncertainty about how the country will leave the European Union.

British Prime Minister Theresa May (C) is seen during the Brexit deal vote in the House of Commons in London, Britain, on March 12, 2019. British Prime Minister Theresa May's Brexit deal was rejected again on Tuesday by MPs in the second meaningful vote in the parliament since January, increasing uncertainty about how the country will leave the European Union.

Photo taken on March 12, 2019 shows the Brexit Deal vote in the House of Commons in London, Britain. British Prime Minister Theresa May's Brexit deal was rejected again on Tuesday by MPs in the second meaningful vote in the parliament since January, increasing uncertainty about how the country will leave the European Union.

British Prime Minister Theresa May (C) is seen during the Brexit deal vote in the House of Commons in London, Britain, on March 12, 2019. British Prime Minister Theresa May's Brexit deal was rejected again on Tuesday by MPs in the second meaningful vote in the parliament since January, increasing uncertainty about how the country will leave the European Union.

Photo taken on March 12, 2019 shows the Brexit Deal vote in the House of Commons in London, Britain. British Prime Minister Theresa May's Brexit deal was rejected again on Tuesday by MPs in the second meaningful vote in the parliament since January, increasing uncertainty about how the country will leave the European Union.

British Prime Minister Theresa May (C) is seen during the Brexit deal vote in the House of Commons in London, Britain, on March 12, 2019. British Prime Minister Theresa May's Brexit deal was rejected again on Tuesday by MPs in the second meaningful vote in the parliament since January, increasing uncertainty about how the country will leave the European Union.

Photo taken on March 12, 2019 shows the Brexit Deal vote in the House of Commons in London, Britain. British Prime Minister Theresa May's Brexit deal was rejected again on Tuesday by MPs in the second meaningful vote in the parliament since January, increasing uncertainty about how the country will leave the European Union.