Hopes for a quick vote on Sen. Markwayne Mullin’s nomination as Homeland Security secretary hang on questions about secretive travel the Oklahoma Republican undertook as a House member a decade ago that are now being examined by his Senate colleagues.

Mullin was questioned extensively about the matter Wednesday by Sens. Rand Paul (R-Ky.) and Gary Peters (D-Mich.), the chair and ranking member, respectively, of the Senate Homeland Security and Governmental Affairs Committee.

Testifying under oath Wednesday, Mullin said he participated in what he described as “official travel” and a “classified trip” as part of a “special program inside the…

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