The Telegraph reports Labour peers take out newspaper advert to tell Corbyn he is 'failing the test of leadership'.
The full page advert, published in The Guardian on Wednesday, criticises Mr Corbyn for a "toxic culture you have allowed to divide our movement", saying it has prompted the resignation of "thousands" of members.
The party, it says, is no longer a "safe place" for its members and supporters.
"We are saying you are accountable as Leader for allowing antisemitism to grow in our party and presiding over the most shaming period in Labour's history," it adds.
The advert is supported by a total of 67 Labour members of the House of Lords, including Peter Hain, Peter Mandelson and Robert Winston, and comes after a damning report by BBC's Panorama programme into the party's handling of allegations of anti-Semitism.
The peers also accuse Mr Corbyn of not having "opened (his) eyes" or "accepted responsibility" for the row which has engulfed the party.
More Labour Splintering
The timing of this attack could not come at a worse time for Corbyn or a better time for Johnson.
Corbyn was already reeling from wishy-washy policy that simultaneously supported Brexit, a referendum, Remain, and a customs union.
Obviously, that's impossible.
'Inevitable' Labour MPs Will Try To Oust Corbyn Over Anti-Semitism
The Huffington Post reports 'Inevitable' Labour MPs Will Try To Oust Corbyn Over Anti-Semitism
“If he doesn’t resign, there will be a clamour for a vote of no-confidence.”
A vote of no-confidence by MPs would be largely symbolic because Labour’s leader is elected by members and not parliamentarians.
MPs can, however, trigger a leadership contest if 20% of MPs - or 49 of them nominate an alternative challenger.
MPs have stepped up criticism of the leader in the wake of a BBC Panorama probe which detailed shocking complaints of anti-Semitism, interviewed former staff members turned whistleblowers and alleged political interference from Corbyn’s communications chief Seumas Milne.
Boris Johnson the Primary Beneficiary
Boris Johnson, the UK's next Prime Minister is the primary beneficiary.
The Liberal Democrats are the secondary beneficiary
Meanwhile, how long can Corbyn hang on as Labour leader?
This looms as a key question in the next election.
Mike "Mish" Shedlock