Party leaders each face questions from an audience of voters in Llandudno.
Eluned Morgan has called for the UK government to stop working with the US on 27 radar dishes.
Leader Eluned Morgan made her pledge as she launched her party's Senedd election manifesto in Swansea.
Opponents have criticised ministers for counting apprentices leaving training within eight weeks.
"Leaving the EU has not been beneficial to Wales," says Eluned Morgan.
An ex-Welsh government minister has argued a secretary of state for Wales was no longer needed.
Three men with connections to Wales and the Labour Party were arrested on suspicion of spying.
Eluned Morgan said Labour would redevelop hospitals in Cardiff and Wrexham, and support a new one in west Wales.
Eluned Morgan said the conflict in the Middle East will have a "knock on effect" in Wales.
