Johnson had pushed for an election rather than attempting to get his Brexit deal legislation through Parliament, where the government lacks a majority and has found itself constrained to the point of paralysis. The next is not scheduled to happen until 2022.
The socialist Labour leader is a vegetarian cyclist with a silver beard and thinning hair who lacks Mr Johnson's charisma but still came within a whisker of scoring a major election upset in 2017.
Labour put forward amendments to give MPs the chance to bring in votes for 16 and 17-year-olds and European Union citizens with settled status, but they were not selected to be voted on by Deputy Speaker Sir Lindsay Hoyle.
Results of a vote is announced in the House of Commons. Johnson and the Conservatives would need to win a majority in Parliament to implement a Brexit plan by the EU's deadline of January 31, 2020.
Elections expert John Curtice from the University of Strathclyde told London radio station LBC on Tuesday that the election is "one Boris Johnson has to win". But the Conservative leader, who said just weeks ago that he would "rather be dead in a ditch" than postpone the October 31 Brexit date, was forced by Parliament to seek the extension in order to avoid a no-deal Brexit, which would damage the economies of both Britain and the EU. The "flextension" can be cut short if Britain can ratify the revised deal of Johnson on a date earlier than the deadline. "Boris Johnson and his Brexit deal in Number 10, or Jeremy Corbyn?".
Tusk, whose mandate finishes at the end of next month, also used his tweet to bid farewell to the British in his current post.
"I will keep my fingers crossed for you", he added.
The Labour Party had so far refused to back an early poll until the threat of a no-deal crash out by end of October had been taken off the table, a condition which was met with the new Brexit deadline now being January 31, 2020.
In a scenario of ongoing uncertainty similar to now - where Britain keeps the economic benefit of unrestricted access to European Union markets but without any long-term guarantees - the economy would be 2% smaller, it forecast. Yet with the United Kingdom still locked in limbo, unable to complete its tortured three-year divorce from the European Union, the election is likely to become a proxy referendum on Brexit.
Writing in the Daily Mirror, he outlined his party's "ambitious and radical campaign for real change".
The sides must now settle on an election date.
Tony Blair was asked whether he would campaign for certain Liberal Democrat candidates, if he "doesn't like the Labour candidate" or where it is the "best chance for casting a vote for Remain".
The second option is also preferred by Labour.
Corbyn did not specify a date in his statement.
Cabinet Office Minister Oliver Dowden said December 12 was preferable because it gave lawmakers a few more days to finish up parliamentary business, and retained Britain's tradition of holding elections on Thursdays.
"They just want to stay out forever, till the twelfth of never - and when the twelfth of never comes around, they will devise one of their complicated parliamentary procedures for more delay", he told parliamentarians during a sometimes-raucous debate, waving his arms for emphasis. "A hung parliament and Boris is out", he said, referring to situation - as now - where no party has a majority in the Commons.
However, it is possible that amendments to the bill could see the date move yet again.
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