He says in a letter to the SLC Executive Committee that any unjustified interference might expose Sri Lanka Cricket to the possibility of having its membership suspended by the ICC Board.

Text of Richardson’s letter:

Apparent appointment of Interim Committee to run Sri Lanka Cricket

I note from reports in the media of today's date that the Government of Sri Lanka intends to form an Interim Committee to run the cricketing affairs of Sri Lanka Cricket.
Whilst we have no further or substantive information about the accuracy or otherwise of these media reports, I just wanted to flag with you the risk that such action could put Sri Lanka Cricket in breach of Article 2.9(B) of ICC's Articles of Association which states as follows: 'Where a Government interferes in the administration of cricket by a Member, including but not limited to interference in operational matters, the selection and management of teams, the appointment of coaches or support personnel, the Executive Board shall have the power to suspend or refuse to recognize that Member...'.
Of course, a full and proper investigation would need to be carried out, but any unjustified interference might expose Sri Lanka Cricket to the possibility of having its membership suspended by the ICC Board, which would have considerably damaging consequences, including the loss of the right for Sri Lanka Cricket to participate in ICC's global events.
I very much hope that Sri Lanka Cricket and the Government of Sri Lanka will be able to resolve any issues that they might have in a mutually agreeable fashion and look forward to receiving your update on what exactly has occurred or is transpiring.