Republican presidential candidate Donald TrumpDonald John TrumpIvanka Trump pens op-ed on kindergartners learning tech Bharara, Yates tamp down expectations Mueller will bring criminal charges Overnight Cybersecurity: Equifax security employee left after breach | Lawmakers float bill to reform warrantless surveillance | Intel leaders keeping collusion probe open MORE is spending Saturday campaigning in Arizona ahead of the state's critical primary on Tuesday. 

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His first rally in Phoenix, Ariz., is scheduled to begin at 1 p.m. Eastern. 

Watch the event live in the video above.