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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