South Carolina Sen. Lindsey Graham believes fellow Republican presidential candidate Donald Trump is “not ready to be commander in chief” and has encouraged voters in his home state to shift their support to someone who is.

A previous feud between the two GOP candidates — which began when Graham called the New York businessman a “jackass,” leading Trump to retaliate by handing out Graham’s cell phone number — resurfaced last week when Graham pledged to “beat [Trump’s] brains out” in the South Carolina primary and continued Thursday when the senator appeared on MSNBC.

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