Turley also mentioned " this demand does not appear to have been made in the form of a court-approved subpoena."
A subpoena was not necessary. They are gov't records, subject to law enforcement review.
I think they were too. But Mueller had a very good and sneaky reason to "kick down the door" without a subpoena. And He's not gonna indict a potus. His job is to uncover the truth behind Russia and Trump.
I don't see it as "kicking down the door."
See d., page 4:
d. Disclosure.
(1) Electronic messages may be treated as Agency records for purposes of the Freedom of Information Act, 5 U.S.C. § 552 and the Privacy Act, 5 U.S.C. § 552a. As such, electronic messages or portions of them may be required to be disclosed upon a proper request.
Additionally, they may be disclosed pursuant to discovery in a legal proceeding or upon request by Congress.
The contents of electronic messages, properly obtained for Federal Government purposes, may be disclosed within the Agency for an official purpose without the permission of the authorized user who created the message.
https://www.gsa.gov/cdnstatic/CIO_2160.2B_CHGE_1_GSA_Electronic_Messaging_and_Related_Services_(Signed_on_6-17-2015).pdf