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Springfield, Ill. • Republican U.S. Sen. Mark Kirk said President Barack Obama was "acting like the drug dealer in chief" when his administration delivered $400 million in cash to Iran contingent on the release of American prisoners — the latest in a string of provocative comments by the Illinois senator caught in a tight re-election race.

Kirk, whose race against Democratic U.S. Rep. Tammy Duckworth could help determine control of the Senate next year, made the remarks during an editorial board meeting last week with The (Springfield) State Journal-Register.

"We can't have the president of the United States acting like the drug dealer in chief," Kirk told the paper, "giving clean packs of money to a ... state sponsor of terror."

Republicans have criticized the Obama administration after it acknowledged that the repayment of the money from a 1970s Iranian account was connected to a U.S.-Iranian prisoner exchange in January. The administration denies the money was "ransom," saying the Islamic Republic would have soon recouped the money one way or another.

A spokesman for Duckworth, Matt McGrath, said Kirk should apologize.

"Senator Kirk's comments are misguided and deeply offensive, and beneath the dignity of the office he holds," McGrath said in a statement.

Kirk's campaign defended his comments, calling the actions from the Obama administration "reckless in the extreme." In a statement, Kirk spokesman Kevin Artl characterized the transaction with Iran as "more representative of nefarious deals than the conduct of the world's greatest democracy."

Kirk, who is chairman of the Senate Subcommittee on National Security and International Trade and Finance, is planning a hearing to discuss the payment next month, his campaign said.

This is not the first time Kirk has found himself on the defensive for something he has said. Last year in June, he said South Carolina Republican Sen. Lindsey Graham, then a presidential hopeful, was a "bro with no ho" because he is unmarried.

"That's what we'd say on (Chicago's) South Side," Kirk said at the time. Kirk later apologized for "inappropriate remarks."

In April of last year, during an interview with the Peoria Journal Star, Kirk said he wanted the government to help black entrepreneurs, spur "a class of African-American billionaires" and make changes "so that the black community is not the one we drive faster through."