Yes they can, and they will.
Trump wanted to sue Schiff, and was told he couldn't do a damn thing, because Schiff had Congressional immunity.
When was the last time a victim of government oppression successfully sued high ranking politicians and Federal institutions?
Think about this: the survivors of the Waco Massacre, who saw their children murdered and even burned to death could not successfully win a lawsuit.
"In the end, it wasn't even close. After a month of testimony and just a few hours of deliberations, an advisory jury cleared the government of wrong doing during the 1993 siege of the Branch Davidian compound in Waco, Texas. Survivors of the fire that ended the siege in April, along with relatives of those who died, had brought a wrongful death action against the government, seeking damages. But the advisory jury wasn't convinced, and found for the government across the board."
