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A top Republican lawmaker on Friday subpoenaed the Treasury Department for documents pertaining to the IRS targeting scandal, after accusing the head of the tax-collection agency of obstructing congressional investigations.

During a tense hearing on Capitol Hill held shortly before lawmakers headed out for summer recess, acting IRS chief Danny Werfel weathered tough questioning from Republicans including Rep. Darrell Issa, R-Calif., chairman of the House Oversight and Government Reform Committee.

Issa claimed the IRS has been slow to produce documents, and that the documents it does produce are so thoroughly blacked out, they are useless to investigators.

“When you eliminate search terms unilaterally you are obstructing us by limiting the scope of discovery. Do you understand that, Mr. Werfel?” Issa said, complaining that the IRS had narrowed the date range for the requested documents.