National security analyst Fran Townsend, the former Homeland Security Adviser to George W. Bush, on Thursday told CBS “This Morning” that Donald Trump’s FBI Director Christopher Wray is “prepared to issue a rebuttal” to Rep. Devin Nunes’ anti-FBI memo should the White House follow through with releasing it.

Townsend explained the FBI is “concerned about sources and methods,” noting officials fear in order to “rebut the contents of the Nunes memo” they would have to reveal sensitive information.

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“The Nunes memo is an advocacy piece, not a fact piece,” Townsend said.

“Director Wray is prepared to rebut—if the White House decides to release the Nunes memo—Director Wray is prepared to issue a rebuttal,” the national security analyst added.

Townsend noted the extensive process required for the FBI to obtain a warrant under the Foreign Intelligence Surveillance Act.

“I ran this unit in the Justice Department that got the FISA warrants,” Townsend said. “No FISA warrant relies on a single piece of evidence, so if the allegation from Chairman Nunes is that they relied solely on the Steele dossier, that’s not possible.”

“It doesn’t work that way,” she added.

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Watch below, via CBS: