"I'm not aware of any plans to make those movements... But we do have some real concerns with some of the activities and some of the scope that the investigation has gone," The Hill quoted Sanders as saying in an interview on Sunday night.
Sanders said she has concerns about the scope of the ongoing investigation and dodged questions about whether President Donald Trump was more concerned about the recent issues with his personal lawyer Michael Cohen than the Mueller investigation into alleged Russian collusion in the 2016 presidential election.
Sanders also did not answer a question about whether Trump had concerns about Cohen turning state's evidence.
The Federal Bureau of Investigation (FBI) raided Cohen's home, hotel room and office last week with Rosenstein's approval.
Trump has reportedly tried to fire Mueller in the past and has been considering firing Rosenstein, The Hill reported.
The New York Times reported on Friday that Trump's advisers were more worried about the investigation into Cohen than Mueller's probe.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)