A House chairman probing the IRS scandal on Wednesday said that President Obama has reneged on a promise to have his aides cooperate with the investigation, forcing the Ways and Means Committee to conduct a dragnet for emails and documents needed to smoke out the truth.

Rep. Dave Camp also revealed that federal agents conducting an investigation into the Internal Revenue Service’s bid to punish Tea Party and conservative critics of the president have yet to talk to a single target of the scandal.