Memo claims Rosenstein approved application to extend surveillance of Carter Page: report

Deputy Attorney General Rod RosensteinRod Jay RosensteinGraham says he'll probe Rosenstein's 25th Amendment remarks The damning proof of innocence that FBI likely withheld in Russian probe Conway's husband: 'Banana republic' if Trump got his wish to go after investigators 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 TrumpDonald John TrumpJoint Chiefs chairman denies report that US is planning to keep 1K troops in Syria Kansas Department of Transportation calls Trump 'delusional communist' on Twitter Trump has privately voiced skepticism about driverless cars: report 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 ClintonHillary Diane Rodham ClintonGOP lawmaker defends Chelsea Clinton after confrontation over New Zealand attacks Klobuchar: Race, gender should not be litmus tests for 2020 Dem nominee Kirsten Gillibrand officially announces White House run 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 NunesDevin Gerald NunesEx-House Intel chair: Intel panel is wrong forum to investigate Trump's finances Nunes warns of the 'straw police' in California Koch-backed group pushes for new limits on Trump's tariff authority 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 MuellerRobert Swan MuellerSasse: US should applaud choice of Mueller to lead Russia probe MORE as the special counsel to lead the Russia probe after Trump in May fired former FBI Director James ComeyJames Brien ComeyA question of privilege: How Trump could still gut the Mueller report The damning proof of innocence that FBI likely withheld in Russian probe Nadler: Half of Trump probe targets likely to comply with document requests MORE.

Updated at 7:58 a.m.