Federal authorities are expected to put back into place a “non-scalable” fence around the entire perimeter of the White House on Monday as law enforcement and other agencies prepare for possible protests surrounding the election, a source with knowledge of the matter confirmed to CNN.

The fence, the same type that was put up during protests this summer, will encompass the Ellipse and Lafayette Square. It will go down 15th Street to Constitution Avenue and then over to 17th Street. The fence will then run up to H Street and across by Lafayette, and then come down 15th Street, the source said.

NBC News was first to report the new fencing. The Secret Service did not respond to a request for comment.

The extra layer of security marks the most high-profile example to date of authorities preparing for unrest following this year’s election, particularly if there is no clear winner come November 4.