Derek Hatton has been suspended by the Labour Party just days after rejoining.
Liverpool’s former deputy council leader was provisionally readmitted to the party earlier this week, some 34 years since being expelled for his Militant links.
Hatton’s application to Labour’s Wavertree chapter coincided with the resignation of Luciana Berger on Monday over allegations of anti-Semitism within the party.
She was one of seven MPs to quit the party and join a new Independent group.
But Hatton’s return now threatens to be short-lived as he now faces a probe into a 2012 tweet in which he appeared to launch an attack on Jewish people.
The 71-year-old’s remarks, which have since been deleted, will be brought before the National Executive Committee for a final ruling on the matter.
Barry Gardiner, Labour’s Shadow Home Secretary, described the decision to permit Hatton’s re-entry following his 1985 removal as a ‘travesty’.
Mr Gardiner confirmed during a Parliamentary debate on antisemitism on Wednesday that he was aware of the ex-councillor’s alleged remarks.
He said: “I wrote to the general secretary of our party, I lodged a formal complaint.
“I understand that action has since been taken in respect of the complaint and I am sure that I will be looking out to see precisely what appropriate action is taken in due course.
“I totally agree with you, I think it was a travesty. Many of us knew for some while that he had applied to rejoin the party.
“But for the news of his readmission to come to public attention on the day, on the very day when some members of our party were forced out I think was appalling.”
Mr Hatton was expelled from Labour by erstwhile leader Neil Kinnock as part of his role in far-left group Militant that operated Liverpool’s local council.