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“The document in question should be viewed for what it is - a baseless political ploy by partisans bent on defending a U.S. Senate seat at any cost,” Miss Kukowski said last week.

But the Defense Department said Mr. Kirk violated policy twice.

In late 2008, Mr. Kirk gave video interviews about Mr. Blagojevich being arrested, the Pentagon statement said. The Kirk campaign counters that regulations allowed him to conduct business related to his congressional duties.

And in July 2009, Mr. Kirk or a staff member wrote on the candidate’s Twitter account that he was on duty at the Pentagon’s National Military Command Center.

The Defense Department required Mr. Kirk to sign a statement acknowledging that political activity is not permitted while on active duty before he was given permission to return to Afghanistan in December 2009.