As Mr. McConnell should know perfectly well, that is not the question at all, core or otherwise. The Obama administration has embraced the idea of using military tribunals for some terrorism suspects. The Christmas bombing suspect, Umar Farouk Abdulmutallab, was arrested in the United States. The American justice system does not allow people arrested in the United States for serious offenses to be detained and held without access to an attorney.

It is good that the administration is pushing back.

In a five-page letter to Mr. McConnell, Attorney General Eric Holder Jr. said that the handling of Mr. Abdulmutallab followed the sensible practices of presidents of both parties. Although Mr. Abdulmutallab stopped talking at one point, he has since begun cooperating, according to administration officials. Law enforcement agents know that many defendants talk after being told of their right to remain silent, Mr. Holder noted.

Republicans like to say that Mr. Obama is giving new rights to terrorists. But Mr. Holder’s letter noted that the Bush administration prosecuted more than 300 people on terrorism-related charges in federal courts without a whiff of complaint from those same Republicans. He said those included Richard Reid, the so-called shoe bomber; Zacarias Moussaoui, the only person convicted of involvement in the Sept. 11 attacks; the man charged with plotting to blow up the Brooklyn Bridge; and another who schemed to bomb the Los Angeles airport.

The Republican propaganda is a distraction from the real issue: that the counterterrorism system is malfunctioning more than eight years after the Sept. 11 attacks. Like many of the nation’s other problems, Mr. Obama inherited this one. For eight years, Congress failed in its legal duty to oversee the intelligence community and the basic operational tasks of the Department of Homeland Security and correct the abusive system of detention at Guantánamo Bay, Cuba, and elsewhere that made our country more vulnerable, not less.

Congress should be helping the president fix those problems, not piling up sound bites for November and trying to bring that shameful detention system home.