Source : Webster's Revised Unabridged Dictionary (1913)

Interpellate \In`ter*pel"late\, v. t. [See {Interpel}.]
   To question imperatively, as a minister, or other executive
   officer, in explanation of his conduct; -- generally on the
   part of a legislative body.

Source : WordNet®

interpellate
     v : question formally about policy or government business