This takes guts by the Congressmen to pursue because all of them can be sure that they will soon be facing serious IRS backlash in the form of “anal probe” style audits.
The IRS boss is just begging to be impeached – New York Post
Top House Republicans make case to impeach IRS boss – Fox News
Update: The Commissioner has posted this response to Congress on the IRS website:
Tax Guru - Ker$tetter Letter 