Donald Trump is threatening to pull out of CNN's town hall Tuesday night because he claims that the network is not treating him fairly.

The GOP presidential front-runner posted the threat on Twitter Tuesday morning, just hours before CNN is set to hold the town hall in Milwaukee, Wisconsin for Trump, Ted Cruz and John Kasich.

Wow, @CNN has nothing but my opponents on their shows. Really one-sided and unfair reporting. Maybe I shouldn't do their town-hall tonight! — Donald J. Trump (@realDonaldTrump) March 29, 2016

CNN, however, often has many of his advisers and surrogates on its air including Trump spokeswoman Katrina Pierson, Trump senior policy adviser Stephen Miller, Trump co-chair and policy adviser Sam Clovis, CNN political commentator Jeffrey Lord who supports Trump and Scottie Nell Hughes, chief political commentator on USA Radio Networks, who also backs Trump.

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The town hall is currently scheduled to air from 8 to 11 p.m. ET on CNN. The three GOP presidential candidates are going to field questions from voters in Wisconsin just a week before it holds its primary.

This is not the first time Trump has threatened to pull out of a scheduled TV news program. He skipped a Republican debate in January and held a fundraiser for military veterans instead. He also recently said he would skip the last scheduled GOP presidential debate in Utah, hosted by Fox News, which forced the network to ultimately cancel it.

According to CBS News' latest count, Trump is leading with 740 delegates, Cruz has 462 delegates and Kasich has 143. A candidate needs to win 1,237 delegates, including the majority of delegates in eight states in order to win the nomination.