Top defense officials during the Trump administration should testify to Congress to explain why it took so long to deploy National Guard troops to help law enforcement officers quell the Capitol riot on Jan. 6, Sen. Gary Peters (D-Mich.) said this week. Peters wants to ask questions of Christopher Miller, who was acting defense secretary on that date, as well as former Army Secretary Ryan McCarthy. “I certainly think we need to hear from them. There’s no question. They were central in the discussion yesterday in the hearing,” Peters, chairman of the Senate Homeland Security and Governmental Affairs Committee, said during a Thursday virtual appearance on CNN. The Pentagon was accused of slow walking requests for backup by William Walker, commanding general of the D.C. National Guard, during a Senate hearing earlier in the week. Walker told lawmakers that it took over three hours to get a request for deployment approved …