WASHINGTON—President Trump’s campaign planned for a raucous show of force at a rally in Oklahoma, but has found itself in a back-and-forth with critics over crowd size Sunday, as the campaign looked ahead to an event in Arizona on Tuesday.

Trump aides blamed the news media for the smaller-than-expected crowd because of coverage of protests and coronavirus infections leading up to Saturday’s rally in Tulsa, Okla. The campaign also said that protesters outside the arena blocked people from entering, though Wall Street Journal…

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