Jeremy Corbyn launched Labour’s European elections manifesto with a renewed promise to back a second Brexit referendum in certain circumstances – but to also respect the result of the first. Yet for ardently pro-Corbyn Europhiles such as Momentum’s Laura Parker, it has been a tough balancing act to support. Also today: Jason Burke on the South African election and the ANC

Jeremy Corbyn launched Labour’s European elections campaign with a renewed commitment to hold a second referendum on Brexit if a “sensible” deal cannot be agreed and there is not a general election. The pledge maintains the party’s precarious balancing act between promising to respect the initial vote and calling for a fresh one.

One of Labour’s MEP candidates is Laura Parker, who joins Anushka Asthana in the studio. Formerly a private secretary in Corbyn’s office, she is now national coordinator for the Labour pressure group Momentum and is campaigning for another public vote. Like many leftwingers who backed Corbyn from the beginning, she is desperate for Labour to commit to stopping Brexit.

Also today: The Guardian’s Africa correspondent, Jason Burke, on the continued decline of the African National Congress. Nelson Mandela’s party appears to have clung on to power in South Africa, but with a reduced majority.