Yvette Cooper says Labour leadership rival Corbyn has “wrong answers” and

Jeremy Corbyn has set out his plan to contain and marginalise MPs who oppose his drive to make Labour more left-wing.

Mr Blair directed his remarks at long-standing members and called on them to “save the party” and heed his warnings, regardless of whether they used to “support me or hate me”.

“We have checked the names against people who either stood against Labour in the elections in May or nominated candidates to stand against us”. That the former PM waited until after registration had closed to act shows he recognises the danger that his words could only galvanise the left.

Around 50 party staff in Newcastle are verifying applications, with a further 30 people at Labour headquarters in London involved in compiling the list of known candidates and supporters from other parties.

She raised questions about Mr Corbyn’s commitment to keeping Britain in the European Union, claiming he would not rule out voting No in the upcoming in/out referendum.

What is more distressing is the unclear nature of whether these complaints are legitimate – or represent a last-ditch attempt to stop the left-winger Jeremy Corbyn becoming leader.

Supporters were met with a series of error messages as they attempted to register for a vote ahead of the planned midday cut-off.

And I think that’s even more worrying because we’d be taking this country into a very unsafe terrain.

Concerns have arisen that supporters of other political groups are signing up to back Jeremy Corbyn for the leadership, Politics Home has learned.

Clause IV, which backed “common ownership of the means of production, distribution and exchange”, was removed from the constitution at a special Labour conference in Easter 1995 when the party was led by Mr Blair.

‘Am I going to traipse through the lobby for some insane left-wing policies for Corbyn when he has had no discipline?

Another, Graham Stringer, said the race should be paused.

MP Barry Sheerman has called for the Labour party’s leadership contest to be halted for an investigation into the “malign” motives of some of those signing up to vote.

Mr Corbyn, who is also calling for an increase in taxes on the wealthy, is one of four contenders for the leadership including Yvette Cooper, Andy Burnham and Liz Kendall – who made a visit to North Wales two weeks ago.

The result will be announced at a special party conference on September 12.