Counter-terrorism police are now leading the investigation into the death of the former MP and Reform UK spokesperson Ann Widdecombe, in light of ‘new information and evidence’. A 28-year old white British man from Rotherham, South Yorkshire, was arrested on suspicion of murder on Saturday. Lucy Hough speaks to the Guardian’s head of national news, Archie Bland

Wes Streeting is expected to launch a leadership challenge against Keir Starmer as soon as Thursday. News of the health secretary’s plans came during the king’s speech, derailing what was supposed to be another chance for the prime minister to reset the political agenda. Lucy Hough speaks to head of national news Archie Bland

Keir Starmer is fighting for his political life as the Mandelson vetting scandal threatens to end his premiership. With no end to the Mandelson saga in sight, and as Labour looks set to suffer major losses at the local elections, can the prime minister survive? Lucy Hough speaks to the Guardian’s head of national news, Archie Bland

Former US ambassador Peter Mandelson has been released on bail after his arrest over claims he committed misconduct in public office during his friendship with the convicted child sex offender Jeffrey Epstein. Police have been investigating allegations that he leaked Downing Street emails and market-sensitive information to the disgraced US financier during his time as business secretary. Mandelson has denied any wrongdoing. Lucy Hough speaks to the Guardian’s head of national news Archie Bland – watch on YouTube