He was a Nationals member of the Australian Senate from July 2008 to June 2019, representing the state of New South Wales.

Prior to entering politics, he was a truck driver, a farmer, a sheep shearer and a small business owner.

[5] Williams is consulted by the media in relation to the Royal Commission into Misconduct in the Banking, Superannuation and Financial Services Industry being one the earliest and strongest advocates for such an inquiry.

[6] He was the sole Government Senator to cross the floor to vote against his party on a number of occasions in support of a Royal Commission into banking prior to 2017.

Most critically, he had gathered sufficient supporters in his party by December 2017 for a Parliamentary Inquiry into Banking such that the Government was facing certain defeat in the House of Representatives.