WH withholds information on IRS turning over a database of tax-exempt organizations to the FBI

Obama administration claims that release of confidential IRS tax information that was turned over to FBI wasn't political, but why won't the Obama administration unwilling to tell congress about what information released?  From Politico:

Republicans charged the IRS on Monday with potentially violating federal tax privacy laws by turning over a database of tax-exempt organizations to the FBI, the latest salvo in their ongoing probe of the IRS’s scrutiny of tea party groups. 

The IRS acknowledged that some non-public taxpayer information was shared in the documents but said a tiny fraction of the data at issue was “inadvertently” shared. 

During the course of its probe into the IRS tea party targeting scandal, the House Oversight and Government Reform Committee said it learned the tax agency sent 1.1 million pages of tax return data about 501(c)(4) organizations to the FBI just before the 2010 midterms, Chairman Darrell Issa (R-Calif.) and Rep. Jim Jordan (R-Ohio) wrote in a letter to IRS Commissioner John Koskinen. . . . 

the IRS said, the data on such disks “can sometimes inadvertently include material that should have been redacted.” 

Oversight contends that the IRS — as well as Lerner — potentially broke the law by releasing taxpayer data, protected under parts of the tax code known as 6103, the lawmakers told Koskinen. . . .