Sanders is the figurehead of White House communications and has become one of Trump's main confidants following the departure of Hope Hicks, the previous communications director.
The CBS story cites sources "sources inside the White House and close to the administration" and says those sources told CBS Sanders is planning to leave at the end of the year.
He said Sanders may be weighing her future options, but he doesn't see any evidence to back up the CBS story.
NY sues Trump Foundation for 'illegal conduct'
Trump slammed the suit in series of tweets made nearly immediately after knowledge of it became public. Trump of using the foundation's charitable assets to pay his legal bills and promote Trump businesses.
Her first press briefing came after Anthony Scaramucci left the White House July 31, just 10 days after he started.
"I know you want to get more TV time", Sanders replied.
"It's not a policy change to enforce the law", Sanders said as the reporter explained the exact Trump administration policy that prompted the change. Less than halfway through Mr. Trump's term, the turnover rate stands at 51 percent, according to the Brookings Institution. Not only that, but another major worry is that people are no longer willing to go to work from such a chaotic administration at the White House with such little job security. In addition to all of that, the president prefers to have a small communications staff.