"It is inconvincible that a member of the national executive committee of the ANC and of cabinet can be allowed to attack such an institution with the impunity and relentlessly, without being called into order," said Phasha.
This follows Gordhan's lawyers filing a review application asking the Gauteng High Court in Pretoria to set aside a report by Mkhwebane that found he flouted the Constitution.
Several organisations have also taken a swipe at Mkhwebane and questioned her credibility. They have also called for her to be axed from her position.
The EFF however, have come out in defence of Mkhwebane and accused Organisation Undoing Tax Abuse, Freedom Under Law, trade union federation Cosatu, Ahmed Kathrada Foundation and the Congress of the People, of attacking the Chapter 9 Constitution by calling for her removal.