Liz Saville-Roberts and Keir Starmer in the Commons.Keir Starmer has apologised to an MP who he said “talks rubbish”.The prime minister was heavily criticised for his “puerile” attack on Plaid Cymru leader Liz Saville-Roberts.Starmer made the comments at PMQs last week after she pointed out his record of performing U-turns.Saville-Roberts said: “Is there any belief he holds which survives a week in Downing Street?”The PM angrily hit back: “Yes, the belief that she talks rubbish.”His comments sparked a furious online backlash.In the Commons today, Saville-Roberts referred to last week’s row as quizzed the prime minister on the UK-EU deal he unveiled on Monday.She said: “The prime minister once argued, and we quote, ‘we should retain the benefits of the single market’.“Given his recent tendency to dismiss the views of others, what would he say to his younger self?”Sir Keir replied: “I think last week I was overly rude and I apologise.“I do respect the honourable member.”