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On Thursday, six Republicans on the Senate Committee on Veterans’ Affairs sent a letter to the committee’s chairman, Sen. Bernard Sanders, Vermont independent, calling for oversight hearings.

“It is obvious from the recent VA scandals that the department desperately needs vigorous oversight,” said Sen. Richard Burr, North Carolina Republican.

The House on Wednesday passed a bill that would make it easier for Mr. Shinseki to fire poor-performing officials, a move that Rep. Jeff Miller, chairman of the House panel overseeing the VA, called “an important step toward ending the culture of complacency.”