John Koskinen stressed that phone tracking "can only be used with a court order."
But the IRS chief says that's a verdict for investigators to make.
IRS commissioner said new anti-fraud systems need to be ready this summer.
Is this the last straw in the funding debate over Obama's unlawful executive amnesty decree?
The IRS chief said the agency might have to shut down for two days.
For months, the IRS told Congress that backups of the sought emails had been deleted.
Lois Lerner's missing emails have reignited the IRS's Tea Party controversy.
Sen. Claire McCaskill said the IRS commissioner is doing a terrible job of communicating.
Internal Revenue Service Commissioner John Koskinen will testify before the House Ways and Means...
Rep. Dave Camp is demanding emails related to the targeting of Tea Party groups.
John Koskinen on Monday made clear that he's prepared to take on Republicans.
The Senate voted 59-36 Friday to put John Koskinen in charge of the troubled agency.
"There are consequences for misleading Congress," Rep. Jason Chaffetz said.
The Senate Finance Committee is demanding details from the IRS about how hackers were able to...
Republicans accused the IRS of seizing the assets of innocent small businesses.
Some Republicans say John Koskinen has lost his chance to win them over.
Two House committees, Homeland Security and Foreign Affairs, will discuss the threat of Sunni...
How much more can the legislative branch extract from demoralized executive branch workers?
The program came after federal courts said the IRS had no legal authority to mandate education...
John Koskinen said the IRS did everything it could to try and fix Lois Lerner’s hard drive.
The decision follows pressure from congressional Republicans to push the rule back.
The agency’s new leadership is making a concerted effort to move past targeting controversy.
The tax agency has its first Senate-confirmed leader in more than a year.
Senate Minority Leader Mitch McConnell (R-Ky.) said he wouldn’t support any nominee to lead the...