All four Labour leadership candidates have apologised to Jewish members over the party’s handling of anti-Semitism, at a heated debate in London.
Rebecca Long-Bailey said she had spoken out over the issue at shadow cabinet, but she could have “done more”.
Her leadership rival Emily Thornberry had accused her of inaction on the issue during a debate on Tuesday.
The Jewish Labour Movement, a party affiliate which co-hosted the hustings, is yet to back a candidate.
Ms Thornberry, the party’s shadow foreign secretary, is the only contender yet to secure her place on the members’ ballot beginning next week.
She is fighting to qualify for the final stage before a midnight deadline on Friday by trying to secure nominations from a total of 33 local branches.