Iowa conservative talk radio host Jan Mickelson’s morning program has become a required stop for Republicans campaigning in the first-in-the-nation caucus state. Nearly every GOP presidential candidate has appeared on Mickelson’s program at least once this year, which is remarkable given that Mickelson recently suggested enslaving undocumented immigrants and often asks his guests to comment on right-wing conspiracy theories such as those surrounding Jade Helm 15 and a toxic spill in Colorado.

Rick Santorum got the full Mickelson treatment yesterday when the radio host asked him to comment on a theory espoused by anti-government tax protesters that the 16th Amendment was never actually ratified and therefore the federal income tax is illegal.

The two got to talking about the “strange bedfellows” behind the 16th Amendment, which Mickelson compared, seemingly disapprovingly, to the coalition of “the business community lined up with the feminists” who backed the 19th Amendment, granting women the right to vote.

He then threw Santorum a curveball: “So, do you think the 16th Amendment actually really passed?”

“There’s a whole book about the 16th Amendment, it was never legally ratified because the language in many, many different states was not uniform and there was all kinds of trickery involved,” Mickelson continued, apparently referring to William Benson’s 1985 book “The Law that Never Was,” whose contentions have been repeatedly debunked.

Santorum didn’t take a stand on the validity of the 16th Amendment (which he has said he wants to repeal), but did agree that progressives are nefarious tricksters. “That’s the progressives!” he said. “It’s the same group, it’s the same group of people. It was the progressive movement that pushed the income tax and it’s the same progressive movement that’s out here pushing Obamacare and all the other socialism that we’re seeing pushed.”