The Welsh Assembly will hold an unprecedented vote of no confidence in the Secretary of State for Wales in his ability to deliver major infrastructure projects.
It comes after the UK Government decided not to back the Swansea Bay tidal lagoon project - on the basis it did not meet the requirements for value for money for the taxpayer.
Because Alun Cairns is not an Assembly member, he will not be forced to resign but it is thought it will be the first time the Assembly has expressed no confidence in a Welsh Secretary.
Mr Cairns told Political Editor Adrian Masters he was "proud of his record" and does not plan on resigning from his role.
Following the announcement yesterday, Plaid Cymru tabled the motion as one of its AMs described the news as "disappointment after disappointment for Wales".