The shadow defence secretary has asked David Lammy to say "when" he was "planning to tell the rest of us" about a foreign offender who was wrongly released from prison last week.
James Cartlidge pressed the deputy PM and justice secretary five times at DPMQs on whether there had been another "asylum seeker offender" that had been mistakenly released.
Lammy declined to answer, although he told Cartlidge to "get a grip".
Now it has been confirmed that a 24-year-old was released from HMP Wandsworth in error on 29 October, just five days after convicted paedophile Hadush Kebatu was mistakenly freed from HMP Chelmsford.
Cartlidge has said: "David Lammy - Now that we know the answer to my question… Can you tell me when you knew and when you were planning to tell the rest of us?"
Lammy has since said he is "absolutely outraged and appalled by the mistaken release" and that the Metropolitan Police is leading "an urgent manhunt".