The publisher of former FBI Director James Comey James Brien ComeyDemocrats fear Russia interference could spoil bid to retake Senate Book: FBI sex crimes investigator helped trigger October 2016 public probe of Clinton emails Trump jabs at FBI director over testimony on Russia, antifa MORE's highly anticipated upcoming book is reportedly enacting strict security procedures to avoid leaks before its publication next month.

Flatiron Books is going to extreme measures to prevent copies of "A Higher Loyalty: Truth, Lies and Leadership" from getting out before April 18, according to Politico, including nondisclosure agreements signed by workers at warehouses.

Editors of "A Higher Loyalty" are also using a password-protected digital file disguised under a code name in their system to make changes instead of using traditional paper copies, the news outlet added.

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The publisher has already moved up the release date for Comey's book, which is expected to detail his interactions with President Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE and add context to his firing last May. It is reportedly planning to ship copies to book stores later than normal as an added precaution against leaks.

Comey, who served in two previous administration, has testified before Congress about the circumstances surrounding his firing but has largely remained out of the public eye on the matter. He told Congress last year that President Trump asked for his loyalty at a dinner and later told him he hoped Comey would "let" the investigation into former national security adviser Michael Flynn "go."

Robert Muller has reportedly asked the Department of Justice for documents related to Comey's firing as part of the special counsel's investigation into Russian election meddling.