Iowa Democratic Party Chairman Michael Kiernan’s attacks against U.S. Sen. Chuck Grassley are simply “insulting Iowans who disagree with the [Obama] administration’s political decision to bring terrorists to the United States,” an aide to the senator told the Iowa Independent Thursday.

Jill Kozeny, communications director for Grassley, was responding to an Iowa Independent story in which Kiernan attacked the senator’s comparison of civilian trials for terror suspects to the murder trial of O.J. Simpson. Kiernan called Grassley’s comparison “fear mongering” designed to “distract from the larger national security issues facing our country.” He said Grassley was calling into question the constitutional right to a trial by jury.

While questioning U.S. Attorney General Eric Holder Wednesday during a Senate Judiciary Committee hearing, Grassley was attempting to make the point that assurances from the administration that the suspects would never be acquitted were not enough.

Holder said in response to Grassley’s questions that the likelihood of acquittal is remote, and if it were to happen, the suspects would never be released in the U.S. Justice Department officials told the New York Times that even if suspects are acquitted, the Obama administration will keep them locked up forever as a “combatant” under the laws of war.

“As Sen. Grassley revealed with the questions he asked yesterday, the administration’s argument for trying the terrorists in a federal court is a hollow one because the Attorney General pledged to keep the terrorists as enemy combatants regardless of the outcome in the courtroom,” she said. “The real questions are, why are terrorists being given more rights than U.S. service members fighting overseas, and why are Americans being subjected to an expensive security risk on U.S. soil if the terrorists could end up being held by the United States under military detention, just as they are being held today?”

Kozeny said Holder’s promise that the suspects will be convicted has “threatened the fairness of the trial by jury that is the bedrock of the U.S. Constitution,” a fact she says undermines Kiernan’s attacks.