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Republican presidential hopeful Ted Cruz said Wednesday night that rival Donald Trump’s campaign staffers are “acting like union boss thugs.” The Texas senator made the comments during an Anderson Cooper-hosted CNN town hall meeting, during which Cruz claimed the Trump staffers are attempting to intimidate potential delegates heading to July’s Republican National Convention.

Cruz made the comment when Cooper asked him to respond to Trump convention manager Paul Manafort’s comments that the Cruz campaign is using “Gestapo tactics” to win delegates.

“It is bizarre,” said Cruz. “Donald and his team, it’s almost like they are subjects in a clinical course in psychology. The conduct they do, literally, they accuse others of doing.”

Earlier in the day on Wednesday, reports emerged claiming that delegates in Colorado and Indiana are being intimidated by Trump supporters. Cruz also brought up reports that Roger Stone, a former Trump operative, was allegedly threatening to reveal delegates’ hotel room numbers if they decided not to vote for Trump.

“Violence doesn’t belong in democracy, and the Trump campaign encourages it over and over again,” Cruz said.