One Nation leader Pauline Hanson says a US congressman gave her two tickets to Donald Trump's presidential inauguration, but she won't say who.

The Queensland senator, who says she won't be making the trip to Washington DC, was secretive when asked who had issued her the tickets.

"It's come from a congressman in the states. Any more than that, don't ask me," Ms Hanson told Sky News on Monday night.

"Only 20,000 tickets have been issued to go to it and two tickets have been issued to me - and the prime minister never got any," she added while laughing.

But Senator Hanson said that she wouldn't attend the inauguration as she has commitments to the party in Western Australia, with her team to make a trip west on Thursday.

The senator's One Nation party was given the green light on Monday as a political party in Western Australia ahead of the March state election.