GOP to grill key ObamaCare official

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In a notice announcing the hearing, Republicans vowed to press Cohen on his office's progress and suggested that the CCIIO director had misled lawmakers in past testimony.

Cohen appeared before a Senate health committee in April and said that the federal exchanges were clearing significant milestones. This week, the Centers for Medicare and Medicaid Services announced that the data hub that will power the marketplaces is secure despite GOP criticisms to the contrary. 

The hearing will take place on Sept. 19.