As the Labour leadership contest tightens, one Labour pressure group has urged voters against supporting Jeremy Corybn as next Labour leader.

Labour First has urged its members to vote for any other candidate but Corbyn, to keep the veteran left-wing politician out, because he would “destroy Labour’s chances of electability”.

 The three other candidates in the Labour leadership contest are Andy Burnham, Yvette Cooper and Liz Kendall.

 From being an absolute outsider, with little chance of securing the needed number of MP endorsements to run, Jeremy Corbyn is now in second place in the leadership race.

 He has been endorsed by Britain’s largest trade union, Unite, and his campaign has been gaining staggering momentum.

 Corbyn  is the left-wing candidate in the race and is well known for his anti-war, anti-austerity stances. He is often at odds with the Labour party line. He opposed the Iraq war and has voted about 533 against the Labour line 533 times since Tony Blair one the election in 1997.

 He has a large grassroots following, especially to the left of the Labour party.

But those to the right of the party, like Labour First, think Corbyn is not a viable option.

Group secretary Luke Akehurst said: "We clearly do not share Jeremy Corbyn's politics and believe these would destroy Labour's chances of electability.

The leadership election was triggered after Ed Miliband resigned on election result day. There will be a new leader in place by the Labour party conference in September 2015. This is a shorter campaign trail than before, and it is the first time the “one member one vote” system is used in the vote.