Peter Robinson is to step down as Northern Ireland First Minister for six weeks amid the storm over his wife's private life and finances.
Mr Robinson has designated Enterprise Minister Arlene Foster to take charge with immediate effect.
Mr Robinson is facing a claim that he knew his wife obtained £50,000 from two developers for her teenage lover but did not tell the proper authorities.
The NI assembly is to investigate the conduct of both Robinsons.
Monday's developments at Stormont as they happened
The Committee on Standards and Privileges said an investigation would be conducted to see if any breaches of the assembly's code had occurred.
Its chairman Declan O'Loan said: "It is clearly in the public interest that an official investigation is carried out in order to establish the full facts in relation to the issues raised in the BBC's recent Spotlight programme."
This is a bad day for Northern Irish politics. There may be new elections soon for a new government. I support the DUP, but the way Robinson and his wife have been acting is morally unacceptable.
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