Pauline Hanson is facing an escalating war with One Nation colleague Brian Burston that could see her sanctioned in Parliament for breaching Senate rules by trying to punish him for refusing to vote the way she wants.

Senator Burston will launch an effort to have the One Nation leader brought before the Senate privileges committee over their spectacular falling out last week when he split from his colleagues on company tax cuts.

Furious at her accusations against him, Senator Burston will seek a finding that Senator Hanson not only tried to interfere with the “free exercise” of his vote in the upper house but also used intimidation and threats to try to get her way.

One Nation leader Pauline Hanson in 2017 with senators Brian Burston and Malcolm Roberts. Credit:Alex Ellinghausen

Senator Burston wrote to Senator Hanson on Monday to warn it was a possible “contempt of the Senate” for her to pressure him into changing his vote on the company tax bill.