Like Schefter said in the above Tweet, the Titans will need to grant permission for Horton to leave.
In the event Jackson is able to lure Horton out of Tennessee, it will be Horton's second stint with the Browns. He was the Browns defensive coordinator in the 2013 season. The Browns ranked ninth in the NFL in total team defense that year.
Horton would head to Tennessee after just one season with the team. In Horton's first year with the Titans, he would lead the defense to a No. 6 rank in total team defense.