Pauline Hanson's One Nation party scored tickets to Donald Trump's inauguration only after continued pestering from its Queensland senator Malcolm Roberts, it has been revealed.

One Nation senators gloated about the supposed invitation earlier this week, which they said had come from a Republican congressman in the US state of Illinois, Adam Kinzinger.

Brian Burston, who will fly to Washington to attend the ceremony on the party's behalf, had told Fairfax Media the tickets were organised through an adviser to Senator Roberts, Darren Brady Nelson, who formerly worked for the Trump campaign.

But a spokesperson for Mr Kinzinger told Buzzfeed News the congressman had accommodated a request for an invitation from the Australian embassy in Washington, and granted them the tickets "to use as they wish".