Two former MPs from the Palmer United Party have spoken out to criticise the party's leader Clive Palmer.

Key points: Glenn Lazarus quit PUP last year and Alex Douglas quit in 2014

Glenn Lazarus quit PUP last year and Alex Douglas quit in 2014 Lazarus says Palmer did not like being questioned and 'would rant and rave'

Lazarus says Palmer did not like being questioned and 'would rant and rave' Douglas does not believe PUP will survive 2016 election, says Palmer has lost interest in politics

Senator Glenn Lazarus, and former Queensland MP Alex Douglas have spoken to Four Corners about their time working with Mr Palmer.

Both consider him to be a bully.

"If you're continually berated and, I guess, yelled at, that's got to be a form of bullying and that was just something I couldn't tolerate for a long period of time," Senator Lazarus told Four Corners.

Glenn Lazarus says Mr Palmer "would remind us very quickly that we knew nothing about politics". ( AAP: Mick Tsikas )

Dr Douglas was the PUP leader in Queensland before quitting the party in 2014.

"I think Glenn's right. I think that, at times, Clive is a bully," Dr Douglas said.

Senator Lazarus has spoken to Four Corners in detail about his time in the Palmer party, following his election to the Senate in 2013.

He said Mr Palmer forbade his senators from dealing directly with Government ministers, and did not like being questioned.

"He would rant and rave … I saw that quite a bit with him," Senator Lazarus said.

"He would remind us very quickly that we knew nothing about politics, because we'd only just arrived in politics and that he'd had 40 years' experience."

Lazarus 'couldn't deal with the stress and sleepless nights'

Senator Lazarus quit the party last year.

"I just couldn't deal with the stress and the sleepless nights and doing something that probably goes against your beliefs," he said.

Dr Douglas quit the party in August 2014, when he fell out with Mr Palmer over the preselection of PUP candidates for the Queensland election.

"He's a person who can be, at any one time, everything from quite funny and in some ways rather endearingly charming to being quite repulsive and pig-headed, stubborn and sometimes intolerable," Dr Douglas said.

"There's a whole lot of things that he's good at, but there's a whole lot of things he's bad at."

Dr Douglas believes the Palmer political party will not survive this year's election.

Alex Douglas believes the Palmer United Party is "completely finished". ( AAP Image/Dan Peled )

He said Mr Palmer had lost interest in politics, because he achieved his two main objectives — removing former Queensland premier Campbell Newman and former prime minister Tony Abbott from office.

"I think that the Palmer Party is finished. I think it's completely finished," Dr Douglas said.

"But I think Clive made a decision to kill it and I think that he made that decision based on he'd achieved his objectives. He probably just should have admitted it earlier."

Remaining PUP senator Dio Wang courted by independents

Mr Palmer has stated that he intends to run again for his Sunshine Coast seat of Fairfax.

Others believe he will attempt to run in the Senate.

The last remaining PUP senator, Dio Wang, is being courted by other independents to join forces in the event Mr Palmer leaves politics.

Independent MP Bob Katter has told Four Corners he would like Senator Wang to join his party.

"We are having discussions now on some joint operations, for the sake of a better word, and I think these questions are up to Dio himself," Mr Katter said.

"I would absolutely love for Glenn Lazarus, Jacqui Lambie and Dio Wang and ourselves to come together, and their voting patterns are almost identical with my voting pattern on everything."

You can watch the Four Corners special on Clive Palmer or catch up on iView.