Liz Kendall has warned that Labour will be out of power for a "generation" if Jeremy Corbyn becomes leader.
BuzzFeed News asked the leadership candidate what she made of Tony Blair's intervention in The Guardian, where he declared that Labour faced "annihilation" under Corbyn.
She told us: "I totally understand why people passionately say don't vote for Jeremy Corbyn – because we'll be in the wilderness for a generation. So I understand why people want to say that. But we still have a month to go in this contest."
Pressed on whether she and her fellow candidates, Andy Burnham and Yvette Cooper, should be doing more to fight Corbyn, she said: "I've been saying all along, he's completely the wrong leader of the party."
"His politics are wrong for the country and we'll be in the wilderness for a generation if he's elected. So far it's been hard getting that message through but it's not going to stop me from making it."
Kendall was speaking after addressing a campaign event in Hammersmith, west London.
In his article, former prime minister Blair warned bluntly that Labour was "in danger more mortal today than at any point in the over 100 years of its existence". He said: "If Jeremy Corbyn becomes leader it won't be a defeat like 1983 or 2015 at the next election. It will mean rout, possibly annihilation."
It came as Labour announced that over 600,000 people have applied for a vote in the party's leadership contest, which has been dominated with the surge in support for left-wing Corbyn.