The Pentagon will continue to limit the information about the Fort Hood shooting it provides to lawmakers to avoid jeopardizing the suspect’s prosecution, Defense Secretary Robert Gates said Friday, brushing off a subpoena threat from a Senate panel.

The Senate Homeland Security and Governmental Affairs Committee has accused the Obama administration of stonewalling its probe by failing to make key officials available for interviews or provide access to intelligence files. This past week, the panel said it would issue subpoenas if the information wasn’t provided by Monday.

Speaking to reporters here, Mr. Gates said the Defense Department wasn’t trying to hide anything from the Senate committee seeking information about whether more could have been done to prevent the November assault, in which 13 soldiers died and more than 30 others were wounded.