Labour former prime minister Tony Blair has said Theresa May is on course to win the General Election "if the polls are right".

The party's most electorally successful leader has been critical of Jeremy Corbyn's leadership but has confirmed he will vote Labour on June 8.

He told Sky News: "If the polls are right, we know who is going to be prime minister on June 9.

"That's not the issue. It will be Theresa May, if the polls are right, if the polls are right.

"I'm not predicting that."

Mr Blair said the "real issue" of the election was whether Mrs May would be given a "blank cheque", rather than Mr Corbyn's leadership.

"It's what mandate does she claim both on Brexit and on the health service, education and all the other things.

"I think the most powerful argument for Labour in this election, because of the way the polls are and the way the opinion polls are on the leadership issue, the most powerful argument for Labour is to say it is important for our democracy that the government is held properly to account and she needs a strong opposition."