Sanders, who has become a confidante of President Trump since the departure of former communications director Hope Hicks, has told friends that she plans to leave the administration at the end of the year.
Those departures include Hicks; Jared Kushner's top communications aide, Josh Raffel; homeland security adviser Tom Bossert; National Security Council spokesman Michael Anton; Trump personal aide John McEntee; director of White House message strategy Cliff Simms; communications aide Steven Cheung; congressional communications director Kaelan Dorr; assistant press secretary Natalie Strom; and deputy director of media affairs Tyler Ross.
And it is going to be harder to find good people to replace them," a source close to the administration told CBS News.
The White House has been plagued by leaks that have infuriated top White House officials, including one about communications aide Kelly Sadler making an insulting joke about Arizona Sen. John McCain, who is suffering from brain cancer.
Sources close to the administration fear that while Mr. Trump has been able to bring in a handful of senior, high-profile replacements like national security adviser John Bolton, National Economic Council director Larry Kudlow and Secretary of State Mike Pompeo, there aren't many more qualified people willing to sign up for such an unpredictable high-wire job.