Deputy Attorney General Rod Rosenstein approved an application last year to extend surveillance of former Trump campaign associate Carter Page, a secret Republican memo claims, according to law enforcement sources and news reports. Rosenstein has been fighting the release of the memo from inside the Justice Department, sources confirm. According to three people familiar with the memo, the FBI and Justice Department’s (DOJ) application was based partially on research by investigator Christopher Steele, who contributed to a dossier containing unverified claims about President Trump‘s ties to Russia.