Jeremy Corbyn has met MI6 boss Alex Younger, pictured, for the first time

Jeremy Corbyn has met the boss of MI6 for the first time amid concerns there could be another snap general election.

The Labour leader was given a briefing by the intelligence chief on potential threats to the nation.

It comes as the potential for another election has been predicted if Theresa May's Brexit negotiations fail.

Jo Johnson's decision to quit as transport minister saw pro-EU and arch-Brexiteers in the Conservative Party unite to attack the Prime Minister's stance.

Mrs May also had to deal with a challenge from Northern Ireland's DUP whose support she needs to command a Commons majority.

According to the Daily Telegraph, Mr Younger invited Mr Corbyn to MI6's headquarters in Vauxhall, south London for an 'acquaintance session'.

A Whitehall source told the paper: 'The feeling was that the time had come for Mr Corbyn to become acquainted with the workings of the intelligence establishment.'

The source added he received a detailed briefing on MI6's organisational and operational structure.

Today Mr Corbyn also indicated he felt sorry for Prime Minister Theresa May over the EU withdrawal negotiations but said she was following the wrong path and that Brexit 'cannot be stopped'.

Asked by German magazine Der Spiegel if he would stop Brexit if he could, the Labour leader said: 'We can't stop it.

'The referendum took place. Article 50 has been triggered. What we can do is recognise the reasons why people voted Leave.'

Mr Corbyn insisted he would not face the same problems as Mrs May if he was in charge of Brexit negotiations.

The Labour leader said: 'No, because we wouldn't be trying to face towards the deregulated economy of the United States, which the one wing of the Tory party is trying to do all the time.

'We would want to make a new and comprehensive customs union with the European Union, one that would obviously protect the Irish border - that's crucial - but also ensure that our supply chains worked in both directions.

'People voted Leave, or they voted Remain, but nobody voted to lose their job. Nobody voted to reduce their living standards or working conditions.'

Mr Corbyn, pictured in London earlier this week, also said Brexit 'cannot be stopped' as calls grow for another referendum with government minister Jo Johnson resigning

Meanwhile, Jo Johnson, who supported Remain in the referendum campaign, delivered a stinging rebuke to Mrs May's Brexit position as he walked out of Government in protest.

He said: 'To present the nation with a choice between two deeply unattractive outcomes, vassalage and chaos, is a failure of British statecraft on a scale unseen since the Suez crisis.

'We are barrelling towards an incoherent Brexit that is going to leave us trapped in a subordinate relationship to the EU.

'With no say over the rules that will govern huge swathes of our economy.'

Boris Johnson backed his brother's decision, saying: 'We may not have agreed about Brexit but we are united in dismay at the intellectually and politically indefensible of the UK position.'

Speaking of his brother, Jo Johnson acknowledged that the Brexit negotiations 'have at least united us in fraternal dismay'.