Inhofe, who serves as ranking member of the Senate Armed Services Committee, sent a letter Tuesday to Army Secretary John McHugh requesting that he conduct a review of the shooting to determine whether the victims are entitled to receive the Purple Heart.

Republicans have criticized the administration for refusing to call the Fort Hood massacre an act of terrorism. Army psychiatrist Nidal Hasan killed 13 and injured 32 in November 2009 and has claimed that he is a "soldier of Allah."

Hasan was sentenced to death last week for the shooting rampage.

“Major Nidal Hasan has now been convicted by a general court-martial on all counts of premeditated murder and attempted premeditated murder and he was sentenced to death,” Inhofe wrote to McHugh. “Based on this evidence it is appropriate that you should evaluate whether this constitutes an international terrorist attack that would entitle these victims to receive the Purple Heart Medal.”

GOP lawmakers have proposed the Honoring the Fort Hood Heroes Act, which would declare that the attack took place in a zone of combat, and that it was a terrorist attack. It also requires the awarding of the Purple Heart to soldiers killed or wounded in the attack.