Reid said that Senate Health, Education, Labor and Pensions Committee Chairman Tom HarkinTom HarkinDistance education: Tumultuous today and yesterday Grassley challenger no stranger to defying odds Clinton ally stands between Sanders and chairmanship dream MORE (D-Iowa) gave GOP members of his committee an additional two weeks to review Perez’s answers to written questions. The committee was scheduled to vote on the Perez nomination on Wednesday, but an anonymous Republican decided to block the nomination that same day.

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“Sen. Harkin already delayed the nomination by two weeks,” Reid said. “After granting additional time out of consideration it was disappointing that an anonymous Republican blocked his nomination.”

Republicans have argued that Perez is an extreme “ideologue.” 

Reid also criticized Republicans for threatening to block the nomination of Gina McCarthyGina McCarthyBusiness leaders must stand up and 'March for Science' on Saturday Trump isn't saving the coal industry. He's letting it compete. EPA chief: ‘Help is on the way’ for farmers MORE to head the Environmental Protection Agency.

“Republicans have decided to play political games with dozens — scores — of President Obama’s nominees,” Reid said. “This has now become a pattern of the Republican Party.”