Anne Donaghy is one of three people referred to prosecutors for consideration over alleged misconduct in public office.
The watchdog's investigation concerns the MP’s spending against their Office Costs budget.
From the outside looking in there is much to discuss, some of it not good from the party's point of view.
The incident is alleged to have happened on 1 October 2023.
The DUP MLA for West Tyrone issued his statement after former Sinn Féin MP Francie Molloy was earlier questioned on the party's delivery of the A5 upgrade.
The DUP MP is accused of a "failure to declare an interest" in accordance with the code of conduct.
The Democratic Unionist Party says it is interested in delivering for the people of Northern Ireland.
The deputy first minister says people who worked alongside Jeffrey Donaldson are "floored, shocked and utterly repulsed".
Andy Burnham has become the UK's fifth prime minster in four years following the departure of Sir Keir Starmer.
