The NLRB has filed a case against Boeing for moving jobs in retaliation for workers exercising their legal rights; employers can move jobs for just about any reason except retaliation for workers exercising their legal rights, but Boeing managed to blatantly and publicly say that this was what they had done. Now the company—and Republicans, especially the ones who get a lot of Boeing contributions—are outraged that Boeing faces any repercussions. So Republicans are starting out outraged at the idea that a federal agency would seek to uphold the law. They're also trying to pass a law making it virtually impossible for said federal agency to uphold the law, not just in the Boeing case but any time an employer wants to move jobs.
And then, with these subpoenas, they're trying to interfere in a case that is in the courts:
NLRB Acting General Counsel Lafe Solomon said in a statement that it was the first time since 1940 that the NLRB has been subjected to a congressional subpoena.
“For months, my staff and I have diligently tried to satisfy the Committee’s desire for information while also preserving the integrity of our process and the rights of the parties in a case being actively litigated,” Solomon said, noting that the agency had already released more than 1,000 pages of documents and was still working to find a reasonable solution.
This is the Republican response to a legal action they don't like: Scream. Threaten. Try to change the law. Demand documents pertaining to an ongoing court case. So, naturally, if they got those documents, they'd be totally respectful of the integrity of the case. Right?