The First Minister, Carwyn Jones, is expected to tackle David Cameron over a delayed decision on transferring control of some taxes and borrowing powers to the Welsh Government. They'll meet in Downing Street where the Prime Minister will host a session of the Joint Ministerial Committee.
The JMC is a chance for the First Ministers and Deputy First Ministers from Wales, Scotland and Northern Ireland to air any grievances with the UK Government. It's usually chaired by the Deputy Prime Minister but once a year the Prime Minister takes charge.
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Showers in the north will spread southeastwards overnight. Temperatures will be higher so not as chilly as list night.
Chilly start to Tuesday, turning into a largely fine and dry day.
Political Editor Adrian Masters was joined in the studio by assembly members Bethan Jenkins, Mick Antoniw and Suzy Davies.