Incoming Liberal Democrats senator David Leyonhjelm has predicted the voting bloc controlled by Clive Palmer will not last.
Mr Leyonhjelm says the Fairfax MP's grip on his Palmer United Party will weaken because there is no "shared ideology" connecting his senators.
Mr Palmer will control four key votes in the new Senate from July with his three PUP senators and Ricky Muir, of the Australian Motoring Enthusiast Party.
Mr Leyonhjelm will form his own voting bloc with Family First senator Bob Day, who he has agreed to vote with on economic issues.
He said on Monday that the PUP-aligned senators were "free-minded individuals" who would not stick by their leader for long.
"Initially he'll probably have their votes locked away," Mr Leyonhjelm told ABC radio.
"They're going to be brand new, they will probably feel safer sticking together. But I don't think that will be the situation down the track
"They're very different individuals. They each have their own minds, I don't think any of them would like having their strings pulled by Clive on a regular basis."
The Australian Financial Review reported on Monday that Mr Leyonhjelm planned to help the government pick off senators allied to Mr Palmer.
But Mr Leyonhjelm said there would be some items, such as paid parental leave, which he would encourage the PUP senators to vote against.
"It's not necessarily acting on behalf of the government, it's acting in accordance with our values," he said.
"We will have a lot of contact with other minor party senators.
"We think will have more contact with them than the government will and our opportunity to talk to them and explain from our point of view will be greater."
Mr Leyonhjelm and Mr Day have signalled they will vote against tax measures in the budget, including the deficit levy and the fuel excise hike, if given the chance.
But Mr Leyonhjelm said he believed both of these measures could pass the senate before July.