Prosecutors expressed concern to a U.S. attorney that they weren't allowed to probe the federal officers who shot and killed Renee Good or Alex Pretti, sources said.
The Democrats' request comes days after Sen. Rand Paul announced that the heads of ICE, CBP and U.S. Citizenship and Immigration Services will testify before the panel on Feb. 12.
The North Carolina State Bureau of Investigation said the SBI and Surry County Sheriff's Office are investigating. Two of the four people who were shot have died. The condition of the other two people is unclear.