Michael Moore is slamming Donald Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE, calling the Republican front-runner a “wuss” and pushing him to participate in Thursday night’s Fox News presidential debate.

The liberal documentary filmmaker wrote on Twitter on Thursday:

Hey @realDonaldTrump she brought me on because she needed a real man on the show. Grow a pair &show up 2nite, u wuss https://t.co/mkVyXkagR1 — Michael Moore (@MMFlint) January 28, 2016

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Trump announced this week that he’s boycotting the debate in Iowa amid a feud with the network and moderator Megyn Kelly. Trump has repeatedly lashed out at Kelly since the first GOP debate, in August, when the “Kelly File” host pressed him about his derisive language toward women.

Trump’s campaign instead will hold a pro-veterans event Thursday at the same time as Fox News’s prime-time showdown, his campaign has said.

Moore, who won an Academy Award for 2002’s “Bowling for Columbine,” appeared as a guest on “The Kelly File” Tuesday and defended its host. “You’re being attacked,” Moore told Kelly, “I’m here for you.”

“What is he afraid of?” Moore asked of Trump. “I’m sitting here, right? Donald, come sit with me, and I’ll hold your hand. She’s fine.”