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A powerful Republican senator called for the appointment of a special prosecutor to investigate the scandal surrounding the Internal Revenue Service’s targeting of conservative groups for extra scrutiny.

Republican South Carolina Sen. Lindsey Graham said Sunday that a special prosecutor should be called upon to investigate the exploding IRS scandal, as well as accusations that the Obama administration’s Department of Justice spied on a Fox News reporter.

“My belief about the IRS scandal is that this culture of going after tea party groups that were on the president’s case about Obamacare did just not accidentally happen. I think it comes from the top in terms of tone,” Graham said in regard to the IRS scandal.