Mining magnate Clive Palmer has labelled Bill Shorten a two-faced liar and unfit to be prime minister, claiming the Opposition Leader's attacks on him left the United Australia Party with no option but to strike a preference deal with the Coalition.

In a 14-minute "press conference" that ended with Mr Palmer walking out without taking any questions, Mr Palmer claimed he had been courted by Queensland Labor senator Anthony Chisholm for UAP preferences.