The US National Security Advisor Mike Waltz has been demoted to UN Ambassador after a controversy involving sensitive military plans and a Signal group chat.

Also on the programme: the US and Ukraine clinch a natural resources deal but an agreement to end the conflict remains elusive; and with Roman Catholic cardinals readying to elect a new Pope, British author Robert Harris talks about his book Conclave.

And Newhour’s Julian Marshall presents his last programme after 51 years of reporting and presenting for the BBC World Service. We bid him farewell.

(Photo: US National Security Advisor Mike Waltz joins US Vice President JD Vance for a visit to the US military's Pituffik Space Base in Greenland on March 28, 2025. Credit: Reuters)