In later remarks to reporters, Mr. Biden added that he had instructed officials to get “to the root of why he had access in the first place.”The Pentagon has provided little information about what security reviews might be underway. While Mr. Biden’s remarks were directed widely to the military and intelligence agencies, officials said that based on what is known so far, the Defense Department will make the initial moves to tighten security. Officials described a reluctance to limit intelligence shared with the Pentagon and said it is more likely that the first steps of any security review will focus on improving how the military gives access to the material. Top Republicans on Friday praised the arrest of the airman even as Speaker Kevin McCarthy accused the Biden administration of having been “asleep at the switch” on protecting the nation’s secrets. But Representative Marjorie Taylor Greene of Georgia went further, calling Airman Teixeira a “hero” who had exposed government secrets the administration has tried to conceal and who was being unfairly targeted for his right-wing views.

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