There are lots of reasons one might be concerned about the severity of U.S. terrorism law. But I wouldn't expect criticism of this aspect of the American criminal justice system from those law-and-order lawmakers clamoring for the United States to be tougher on terrorism.
Does an accused man have the right to hear classified evidence he already knows, when it's directly relevant to whether he'll be put to death? Not in a U.S. military commission, according to the government.
In the real world, where evidence obtained through torture is inadmissible, it remains unclear whether the government's attempts to set up a judicial system for alleged terrorists will ever be successful.