The petition called for withdrawal from Europe's fishing policy

In March, Holyrood's European committee voted to ask Agriculture Minister Ben Bradshaw to the Scottish Parliament.

But committee member and Conservative MSP Phil Gallie said a leaked executive e-mail tried to discourage the Westminster minister from attending.

The petition calls for the UK to be withdrawn from Europe's fishing policy.

Meanwhile, the committee's deputy convener Irene Oldfather will ask whether an MSP who acted as a substitute at the 28 March European meeting should have been allowed to vote.

Vote split

Richard Lochhead stepped in following the death of his fellow SNP MSP Margaret Ewing.

The vote to invite a Westminster minister to talk on the petition collected by the Fraserburgh-based Cod Crusaders campaign was split 4-4, before convener Linda Fabiani's casting vote in favour of the move.

Mr Gallie will also raise his concerns on Tuesday that a leaked e-mail shows the executive later tried to "interfere" with this decision.

The e-mail was sent by an executive official to a Scottish fishing organisation following the European committee's meeting on 28 March.

It was leaked to Carol MacDonald, a member of the Cod Crusaders, and she contacted the SNP and Scottish Conservatives.

I feel any member of the Scottish Parliament will take exception to the executive attempting to subvert a committee Phil Gallie

The e-mail includes a line saying that the tendency of ministers from the UK Government's Department for Environment Food and Rural Affairs (Defra) is not to appear before Scottish Parliament committees.

This is because it "blurs the lines of accountability".

The executive email added: "We and Defra are considering."

Mr Gallie said: "I feel any member of the Scottish Parliament will take exception to the executive attempting to subvert a committee."

He is looking for clarification to whether the email was solely the responsibility of the civil servant who sent it, or if it was sanctioned by the executive.

A Scottish Executive spokeswoman said last month that it was appropriate for officials from both the Scottish and UK administrations to advise their ministers on previous practice and protocols about Westminster ministers attending Holyrood.