The conservatives have done the same thing with the Labor Secretary.

From the NLRB Chairman via Work in Progress:

“I am disappointed that we still do not have a fully constituted Board despite the naming of three nominees last summer. The Board has been in limbo for a long time. For more than two years, the Board has had to operate with three vacancies, leaving only myself and Member Peter Schaumber to decide the hundreds of cases that come before us. We have done our best to carry out the Board’s important work, issuing more than 500 decisions in cases involving thousands of workers across the country. But our authority to do so has been challenged and now the Supreme Court will decide whether we can continue to function. At the same time, the Board has been unable to move forward on the most significant cases before it. I look forward to a time in the near future when the Board is back at full capacity resolving issues vital to American workers and their employers.”