His first Prime Minister's Questions since entering Number 10 came a day after he suspended seven Labour MPs for backing an SNP motion to abolish the welfare limit.
Sir Keir said: "The last Labour government lifted millions of children out of poverty, something we are very, very proud of.
"This Government will approach the question with the same vigour with our new task force. Already we've taken steps: breakfast clubs; abolishing no-fault evictions; decent homes standard; Awaab''s Law; and a plan to make work pay.
It came in response to a question by SNP Westminster leader Stephen Flynn, who pointed to former prime minister Gordon Brown's call for Scottish voters to vote Labour to end child poverty ahead of the General Election.
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