Bernie Sanders, a self-identified democratic socialist seeking the Democratic presidential nomination, said that he agreed to appear on the Republican-friendly Fox News with a specific goal in mind.

“I think it is important to talk to those people and say, ‘You know what? I know many of you voted for Donald Trump, but he lied to you. He told you, for example, he was going to provide healthcare to all people, now he wants to throw 30 million people off the healthcare that they had. He told you that he was going to give tax reform that would not benefit the wealthy. [But] 83 percent of the benefits go to the top 1 percent,” said Sanders, a US senator from Vermont making his second run at the Democratic nomination.

“So I think it is important to talk to Trump supporters and explain to them to what degree he has betrayed the working class of this country and lied during his campaign in terms of what he would do,” added Sanders, who is leading the large field of contenders for the Democratic nomination in reported fundraising.

Pressed on why he hasn’t released tax returns yet, Sanders replied that he would make 10 years’ worth “all public very shortly.”

Sanders challenged Donald Trump to follow suit.

“By the way, I’m delighted to do that, proud to do that. Hey, Mr. Trump, you do the same thing,” Sanders said.

Note: This post was updated.