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Just nine days before the FBI applied for a Foreign Intelligence Surveillance Act (FISA) warrant to surveil a top Trump campaign aide, bureau officials were battling with a senior Justice Department official who had "continued concerns" about the "possible bias" of a source pivotal to the application, according to internal text messages obtained by Fox News.

The 2016 messages, sent between former FBI lawyer Lisa Page and then-FBI Deputy Director Andrew McCabe, also reveal that bureau brass circulated at least two anti-Trump blog articles, including a Lawfare blog post sent shortly after Election Day that called Trump possibly "among the major threats to the security of the country."

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Another article, sent by Page in July 2016 as the FBI's counterintelligence probe into Russian election interference was kicking off, flatly called Trump a "useful idiot" for Russian President Vladimir Putin. Page told McCabe that then-FBI Director James Comey had "surely" read that piece. Both articles were authored in whole or part by Benjamin Wittes, a Comey friend.

Further, the texts show that on Sept. 12, 2016, Page forwarded to McCabe some "unsolicited comments" calling then-GOP Rep. Trey Gowdy a "total d--k." Gowdy, at the time, was grilling FBI congressional affairs director Jason Herring at a hearing on the FBI's handling of the Clinton email investigation.

But perhaps the most significant Page-McCabe communications made plain the DOJ's worries that the FISA application to surveil Trump aide Carter Page was based on a potentially biased source -- and underscored the FBI's desire to press on.

Fox News is told the texts were connected to the ultimately successful Page application, which relied in part on information from British ex-spy Christopher Steele – whose anti-Trump views are now well-documented – and cited Page’s suspected Russia ties. In its warrant application, the FBI assured the FISA court on numerous occasions that other sources independently corroborated Steele's claims but did not clearly state that Steele worked for a firm hired by Hillary Clinton's campaign.

One-time advisor of U.S. president-elect Donald Trump Carter Page addresses the audience during a presentation in Moscow, Russia, December 12, 2016. REUTERS/Sergei Karpukhin - RC165B503FF0

One-time advisor to President Trump Carter Page addresses the audience during a presentation in Moscow, Russia, December 12, 2016. REUTERS/Sergei Karpukhin - RC165B503FF0

Carter Page has not been charged with any wrongdoing despite more than a year of federal surveillance, and he has since sued numerous actors -- including the Democratic National Committee (DNC) -- for defamation related to claims that he worked with Russia.

"OI [Office of Intelligence] now has a robust explanation re any possible bias of the chs [confidential human source] in the package," Lisa Page wrote to McCabe on Oct. 12, 2016. "Don't know what the holdup is now, other than Stu's continued concerns."

It's unclear whether the confidential source in question was Steele or another individual. "Stu" was an apparent reference to Stuart Evans, then the DOJ's National Security Division deputy assistant attorney general. In one previously unearthed and since-unredacted text message, former FBI Special Agent Peter Strzok texted Lisa Page that he was "Currently fighting with Stu for this FISA" in late 2016.

(In text messages above, "incoming" refers to texts from McCabe; "outgoing" refers to texts from Page)

"Strong operational need to have in place before Monday if at all possible, which means to ct tomorrow," Page added. "I communicated you and boss's green light to Stu earlier, and just sent an email to Stu asking where things stood. This might take a high-level push. Will keep you posted."

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Minutes later, Page sent another urgent text to McCabe: "If I have not heard back from Stu in an hour, I will invoke your name to say you want to know where things are, so long as that is okay with you."

On Oct. 14, 2016, Page again wrote to McCabe, this time concerning a meeting with the White House.

“Just called," Page said to McCabe. "Apparently the DAG [Deputy Attorney General Sally Yates] now wants to be there, and WH wants DOJ to host.  So we are setting that up now.  ... We will very much need to get Cohen’s view before we meet with her.  Better, have him weigh in with her before the meeting. We need to speak with one voice, if that is in fact the case.” ("Cohen" is likely then-Deputy CIA Director David Cohen.)

McCabe responded within the hour: "Thanks. I will reach out to David." On Oct. 19, Page wrote to McCabe that the "meeting with WH counsel is finally set up."

Lisa Page did not respond to Fox News' inquiries as to whether the meeting was designed to brief the White House on the FISA application or some other matter. Page also did not reply to Fox News' inquiries about the DOJ's concerns over the FISA application, or dispute that the texts related to the Carter Page warrant application. McCabe and the FBI declined to comment. Fox News has also reached out to the DOJ for comment.

Former FBI lawyer Lisa Page arrives for a closed door interview with the House Judiciary and House Oversight and Government Reform committees, Friday, July 13, 2018, on Capitol Hill in Washington. (AP Photo/Jacquelyn Martin)

Former FBI lawyer Lisa Page arrives for a closed door interview with the House Judiciary and House Oversight and Government Reform committees, Friday, July 13, 2018, on Capitol Hill in Washington. (Associated Press)

The FISA application eventually filed by the FBI on Oct. 21, 2016 stated, "The F.B.I. believes [Carter] Page has been the subject of targeted recruitment by the Russian government."

The FBI went on to allege that Carter Page "has established relationships with Russian government officials, including Russian intelligence officers," and that the FBI believed "the Russian government’s efforts are being coordinated with [Carter] Page and perhaps other individuals associated with” Trump's campaign. Page, the FBI told the FISA court, “has been collaborating and conspiring with the Russian government.”

Fox News' Cyd Upson contributed to this report.