Deputy Attorney General Rod Rosenstein Rod RosensteinDOJ kept investigators from completing probe of Trump ties to Russia: report Five takeaways from final Senate Intel Russia report FBI officials hid copies of Russia probe documents fearing Trump interference: book MORE approved an application last year to extend surveillance of former Trump campaign associate Carter Page, according to a secret Republican memo detailed in a The New York Times report.

According to the Times, which cited three people familiar with the memo, the FBI and Justice Department's application was based partially on research by investigator Christopher Steele, who compiled a dossier containing unverified claims about 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's ties to Russia.

The GOP memo alleges officials did not sufficiently explain their reasoning for extending the surveillance, it added.

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There is no information that the FBI or Justice Department did anything improper in their attempts to get a surveillance warrant, according to the Times. The newspaper noted, however, that Republicans could seize on the information and allege that Rosenstein didn't properly vet the application.

White House spokesman Hogan Gidley said in a statement that Trump "has been clear publicly and privately that he wants absolute transparency throughout this process."

"Based on numerous news reports, top officials at the F.B.I. have engaged in conduct that shows bias against President Trump and bias for Hillary Clinton Hillary Diane Rodham ClintonBiden leads Trump by 36 points nationally among Latinos: poll Democratic super PAC to hit Trump in battleground states over coronavirus deaths Battle lines drawn on precedent in Supreme Court fight MORE," he said, according to the Times.

"While President Trump has the utmost respect and support for the rank-and-file members of the F.B.I., the anti-Trump bias at the top levels that appear to have existed is troubling.”

Page served as Trump's foreign policy adviser until September 2016.

Congressional Republicans on Sunday pleaded their case for releasing the classified, four-page memo, which was produced by staff for Rep. Devin Nunes Devin Gerald NunesSunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Sunday shows preview: With less than two months to go, race for the White House heats up Sunday shows preview: Republicans gear up for national convention, USPS debate continues in Washington MORE (R-Calif.), chairman of the House Intelligence Committee, based on classified documents provided by the Justice Department and FBI. The memo is said to contain allegations that senior FBI officials abused a surveillance program to target the Trump campaign last year.

Many Republicans want the memo to be released publicly, but the manner of its release, and whether it should be reviewed first by the administration, is a matter of dispute.

A report last week in CNN said Trump had been venting about Rosenstein and has made comments about wanting to remove him.

Four sources told the network that Trump in recent weeks maintained his frustration with Rosenstein, the No. 2 Justice Department official overseeing the federal Russia probe.

Rosenstein appointed Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE as the special counsel to lead the Russia probe after Trump in May fired 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.

Updated at 7:58 a.m.