Markwayne Mullin says “I won’t back down from a challenge” after Rand Paul slams past comments

From CBS News.

Sen. Markwayne Mullin is testifying before the Senate Homeland Security & Governmental Affairs Committee as he vies to become the Department of Homeland Security secretary. Mullins’ opening statements followed Sen. Rand Paul’s angry rebuke of the senator’s past comments and violent outbursts.

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