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To understand Trump, look to Pat Buchanan

08:04

Long before Trump campaigned on a nationalist, anti-immigrant platform, Pat Buchanan paved the way with his 'America First' campaigns. But there's a catch: Trump denounced Buchanan as being a bigot. Steve Kornacki explores the parallels between Buchanan of the 90s and the Trump of today. Steve Kornacki previews his new book.