Jordon Steele-John is studying politics and history at university but he's about to ask his teachers for a deferral. They shouldn't mind - he's about to make political history as Australia's youngest-ever senator.

After a week of soul-searching, the 22-year-old Green has decided to take up the Senate seat left vacant by Scott Ludlam.

In an exclusive interview with Fairfax Media, the disability advocate said he has the full support of Richard Di Natale and his parliamentary team - despite speculation he was pressured to stand aside for a more conventional candidate.

"I have experienced no pressure whatsoever," Steele-John said. "I've only experienced the total and complete support of the entire party to come to whatever decision I felt was right for me and for the party."