The UK is on course for a December general election after Jeremy Corbyn announced that he would support holding a poll.
But what we still don't know is exactly when the election will be held.
Prime Minister Boris Johnson had been hoping to hold the election on Thursday December 12.
Liberal Democrats and the SNP had backed the idea of an election on Monday December 9. That's apparently because they want to hold the election before students - who might be registered to vote at their university address - go home for Christmas.
The Conservatives, the Lib Dems, led by Jo Swinson, and the SNP are believed to be in talks about a date. They could end up agreeing to hold the poll on December 10 or December 11.
Mr Corbyn has not yet named a preferred date for the general election, although in a speech on Monday he suggested he preferred December 9 to December 12.
We should find out this afternoon what the date is going to be, as MPs vote on legislation to allow the election to go ahead.
The PM will attempt to convince the Commons to vote for a December 12 election using a short Bill which sets aside the Fixed-Term Parliaments Act (FTPA).
The PM's official spokesman said a December 9 vote would not be "logistically possible" but said other proposed compromise dates would be considered by the Government.
Mr Corbyn's move does not quite mean a December election is certain, with Labour expected to support amendments to the Bill.
An alteration to the polling date and other amendments reflecting their policy, such as votes for 16 and 17-year-olds, are being considered.
Downing Street said votes for EU nationals could cause "administrative chaos" while allowing 16 and 17-year-olds to take part would be "administratively impossible" to deliver.
"There are long-standing conventions that election laws should only be changed after appropriate consultation," the Prime Minister 's spokesman said.
"The Electoral Commission warns against changing electoral laws less than six months before an election."
Some Labour MPs have indicated they could vote against a general election, even though Mr Corbyn is now supporting one. They include Redcar MP Anna Turley and North Durham MP Kevan Jones.
