Federal Liberal Party director Brian Loughnane is being pressured to back sweeping changes to governance arrangements that could threaten his tenure as party boss.

The ABC understands a group of senior office bearers will demand a "structural review" of the party's internal workings, leading to changes to its constitution, at tomorrow's meeting of the Federal Executive Council in Canberra.

The contents of two letters, leaked last week, from federal treasurer Philip Higginson are driving the demands.

The letter described as a "serious problem" Mr Loughnane's marriage to Peta Credlin, the Prime Minister's chief of staff.

It also called for greater financial transparency after attempts to "maintain a close watch on where the [party's] money went" met with "stonewalling and obfuscation".

The ABC understands a phone hook-up between state presidents yesterday found strong support for a "thorough investigation" of Mr Higginson's claims.

A dinner tonight is expected to thrash out a final position.

A senior Liberal backer of Mr Loughnane told the ABC he would be "surprised" if there was a call for a substantial review at tomorrow's meeting.

"Everything is in good shape, nothing has been demonstrated to the contrary," he said.

"There is not a problem to be fixed."

The source said the fact Mr Higginson had signed off on the party's accounts showed finances were in order.

A source told the ABC any attempt by Mr Loughnane to "water down" such an investigation would "not be acceptable" to those demanding change.

"People would be bloody angry," the source said.

Asked if change to the party's constitution could lead to Mr Loughnane's job being untenable, the source agreed it was a potential outcome.

"We're not there yet. This is a step-by-step process," the source said.

State presidents "wanted to get to the bottom" of rumours about discrepancies in the party's accounts, the source added.

Another source told the ABC some people in the party's organisational wing view the Prime Minister's refusal to dismiss Ms Credlin as further motivation for changes to governance rules.

A review of the party's constitution is due to be discussed in June, seen by agitators for change as an opportunity to rewrite the governance rules.

Tomorrow's meeting begins at 9:00am.

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