New poll suggests Labour would win a second general election.

Survation poll finds Jeremy Corbyn's party on 45% of the vote to the Conservatives 39%.

Pressure is growing for Boris Johnson to challenge Theresa May to stand down.

Poll finds voters would be less likely to vote Conservative under Johnson.

LONDON — Jeremy Corbyn could be heading for Downing Street if a second general election is held this year, a new poll has found.

The Survation poll for the Mail on Sunday finds that Labour would win 45% of the vote to the Conservatives' 39%, if voters were sent back to the polls.

Survation / MoS poll:

Labour: 45% (+5)

Conservative: 39% (-3)

Lib Dem: 7% (-)

UKIP: 3% (+1)

(Changes with the general election result)

It is the first time Labour have been ahead in a national opinion poll since March 2016.

Such a result would leave Labour as the largest party in parliament with Corbyn the favourite to lead a minority or coalition government.

The poll also found that voters now believe that Theresa May should resign as prime minister. 49% believe she should now stand down as opposed to 38% who believe she should stay.

Asked if she was a "strong and stable leader" just 36% agreed and 50% disagreed.

A separate YouGov poll for the Sunday Times found that Corbyn is now neck-and-neck with May on who the public believe would make the best prime minister. 39% say Corbyn would make the best PM and 39% say May with 22% unsure.

Britain could be forced to go back to the polls later this year after the Conservatives failed to win a majority in this week's general election.

The Conservatives are currently in discussions about a possible 'supply and confidence' deal with the Democratic Unionist Party.

However, pressure is growing among Tory MPs for the foreign secretary, Boris Johnson, to challenge May for the leadership.

The Times reports that five cabinet ministers have urged him to stand against her.

"He has been inundated with messages of support," one ally told the paper.

"We are facing a populist and they have realised we need someone who can talk to the people. We need a Brexiteer. Boris is the only option with the liberal values, Brexit credentials and popular appeal."

However, today's Survation poll finds that Johnson would not necessarily improve the Conservatives' chances of winning a second general election.

31% of voters said that Boris as leader would make them less likely to vote Conservative as opposed to just 23% who said it would make them more likely to vote Conservative.

Asked about the prospect of a second general election, Corbyn told the Andrew Marr show that it would be a "good thing" and added "we're ready any time."