The former heads of the National Association of General Practitioners says it was wrong for one group of GPs to have a copy of a contract agreement - but not another.
GP Maitiu O'Tuathail and Dr Andrew Jordan say they got a finalised copy from the then-Taoiseach to keep all general practitioners informed.
Leo Varadkar has admitted to sharing a version of the Irish Medical Organisation's agreement - but says it wasn't unlawful.
The Tanaiste will face questions in the Dáil on the issue tomorrow.