North Dakota Gov. Doug Burgum injured his leg on Tuesday and may not be able to stand at the GOP presidential debate Wednesday night, a spokesperson confirmed to POLITICO.

The governor was injured while playing a game of pickup basketball in Milwaukee and went to the emergency room, spokesperson Lance Trover said. CNN reported the news first.

Burgum is slated to appear along seven other candidates on Wednesday night in the biggest event of the Republican primary so far — although Donald Trump, the field’s frontrunner, will skip. The debate will air on Fox News at 9 p.m. ET.