Go back to my Post #15 and read it again.
In this particular situation, it looks like the DOJ is taking the exact opposite stance that I would expect them to take if their motivations were as you described.
Why would Mueller serve a subpoena on a foreign-owned firm in an attempt to hide information? The foreign-owned firm could release the information in public and embarrass the hell out of Mueller -- and the U.S. government. But that's not what is happening here. It's the foreign-owned firm -- NOT MUELLER -- that is trying to keep everything secret.
“Why would Mueller serve a subpoena on a foreign-owned firm in an attempt to hide information?”
Hide information?
Mueller is not trying to hide information, he is trying to make the company cough up information; he thinks the company has something he can exploit to hurt Trump.