Biden gestures after donning a pair of sunglasses as he delivers the Class Day Address at Yale University in New Haven, Connecticut on May, 17, 2015. Jessica Hill/AP/File

It feels like a lifetime since Joe Biden was in the Oval Office, such is the turmoil and transformation unleashed since he went home to Delaware.

But one person in Washington never stops obsessing about the 46th president — his predecessor and successor.

Donald Trump rarely appears in public without complaining about Biden’s policies or flinging an insult at his mental or physical capacity.

His obsession betrays deep personal and political antipathy and spite towards a predecessor who has left the political stage. It’s also built on a foundation of Biden’s failures, especially over a surge of migrants across the s

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