Washington (CNN) - As he claims to get more serious about mounting a presidential bid, Donald Trump is taking fire from an influential conservative group that claims the business mogul is "just another liberal."
"Donald Trump for President? You've got to be joking," said Chris Chocola, the president of the conservative anti-tax group Club for Growth. "Donald Trump has advocated for massive tax increases that display a stunning lack of knowledge of how to create jobs."
Trump has, in the past, expressed support for positions that are embraced by liberal voters, including abortion rights (though he has since said he is pro-life). The "Celebrity Apprentice" host also supported then-Democratic presidential candidate Hillary Clinton in 2008.
But the Club for Growth is most concerned with Trump's previous endorsements of a universal healthcare plan and hiking taxes on Chinese imports.
"His love for a socialist-style universal health care system and his alarming obsession with protectionist policies are automatic disqualifiers among free-market conservatives," Chocola said.
Trump advocated for universal healthcare in his 2000 book, The America We Deserve, writing that the goal should be to "make reforms for the moment and, longer term, to find an equivalent of the single-payer plan that is affordable, well-administered, and provides freedom of choice."
But earlier this year, Trump expressed disapproval with the plan passed under President Obama, saying it is "destroying many, many companies."
Meanwhile, Trump's proposal for a tax hike on Chinese imports came during a recent interview with Fox's Bill O'Reilly, during which he argued that merely suggesting such a tariff would bring China to the negotiating table.
"You're never going to have to do it because they are going to come to you. They're going to call you and say, 'What do we have to do?'" Trump told O'Reilly earlier this month.
Trump has said he will decide on a presidential run before June.