Political parties are readying themselves for a general election campaign after MPs voted for a 12 December poll.
The legislation approved by MPs on Tuesday will later begin its passage through the House of Lords, where it is not expected to be opposed.
Boris Johnson says he is ready to fight a “tough” general election.
Labour leader Jeremy Corbyn said the snap poll gave a “once-in-a-generation” opportunity to transform the country.
His shadow chancellor, John McDonnell, said the election wouldn’t just be about Brexit – telling BBC Radio 4’s Today programme: “It will be about austerity [and] about what’s happen to our public service.”
But Mr Johnson hopes the vote will give him a fresh mandate for his deal to leave the EU and break the current deadlock in Parliament.
He told Conservative MPs it was time for the country to “come together to get Brexit done”, adding: “It’ll be a tough election and we are going to do the best we can.”
The poll comes after the EU extended the UK’s exit deadline to 31 January 2020 – although Brexit can happen earlier if a deal is agreed by MPs.
The leaders of the UK’s main two political parties will face off for Prime Minister’s Questions at midday on Wednesday.
What have the other parties said?
The Liberal Democrats and the SNP both see the election as a chance to ask voters whether Brexit should happen at all.
Lib Dem leader Jo Swinson said the poll was “our best chance to elect a government to stop Brexit”.
Asked if she would form a coalition government with Labour or the Conservatives, she said: “I can’t be clearer – neither Boris Johnson nor Jeremy Corbyn is fit to be prime minister.”
Mr McDonnell also said there would be “no deals, no coalitions” with other parties if Labour failed to win an overall majority.
For the SNP, Scotland’s First Minister Nicola Sturgeon said an election was an opportunity for the country to hold another independence referendum.
“A win for the SNP will be an unequivocal and irresistible demand for Scotland’s right to choose our own future,” she said.
But the Scottish Conservatives claimed voting for their party would keep Scotland in the UK.
Brexit Party leader Nigel Farage welcomed the election, tweeting the deadlock had been “broken” and “Brexit now has a chance to succeed”.
But co-leader of the Green Party Jonathan Bartley said the poll should be “a climate election” and focus on environmental issues.
When the House of Lords approves the election bill today then we will be on course for a 12 December winter election.
It is set to be one of the most unpredictable and epic elections of modern times.
Unpredictable, because Brexit totally overshadows it, but also because Brexit has totally reshaped our politics, too.
The main parties can no longer rely on the traditional class party residual loyalty. Instead, we have an emerging sort of identity culture politics which has changed the game entirely.
And epic in the sense that the sort of promises the two main parties are making are gargantuan huge spending promises.
It is going to be a titanic contest.
How did we get here?
On Tuesday Mr Johnson’s team tabled a one-page bill proposing a 12 December election to the Commons which needed the support of only a simple majority of MPs.
Labour’s amendment to change the date of the proposed election from 12 to 9 December was rejected and MPs voted to back the government’s original bill by 438 votes to 20.
More than 100 Labour MPs did not take part or abstained in Tuesday’s crucial vote, while 11 voted against an election. A total of 127 Labour MPs, including Mr Corbyn, supported the election.
The bill, approved by MPs, paves the way for the first December election since 1923.