IRS Commissioner John Koskinen will be in the congressional hot seat this morning.
He'll appear before the house committee headed by Republican Darrell Issa.
The committee is investigating the alleged targeting of tea party groups seeking tax exempt status.
Lois Lerner, the former IRS official at the center of the scandal, invoked the fifth amendment for a second time at a hearing earlier this month.
Issa's said to be considering contempt charges against her.
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