Isabel Hardman presents highlights from Sunday morning's political shows. The prime minister is in a frustrated mood as he bats away questions about the general election. Dan Poulter has defected to Labour, and Wes Streeting says more disaffected Tories are welcome. Humza Yousaf is walking a tightrope as he faces two votes of no-confidence. And Streeting defends Labour's decision to keep the pensions triple lock. Produced by Joe Bedell-Brill.