Two-time Super Bowl champion James Harrison has seen enough of Mike Tomlin and has urged the Pittsburgh Steelers to move on from the veteran head coach.Tomlin is one of the longest-serving head coaches in modern NFL history. He has coached the Steelers for 18 seasons, and he's never endured a losing season. However, the Steelers have struggled for postseason success in recent years and a 6-6 record this season has raised the heat on Tomlin."I have never been a person who thought Coach Tomlin was a great coach," Harrison said on the "Deebo and Joe" podcast. "I thought he was good. I’ll be honest, part of that is because, when I was slated to be the starter when Joey (Porter) left, he drafted one and two outside linebackers."A coach is someone who tells you what to do, and it doesn’t matter if what they’re telling you to do is right or wrong. A good coach gets you to play to your potential. And right now, the players we have on that team, I have seen play, they’re not playing up to their potential. A great coach gets you to play beyond your potential. Something has to be done. I know the Steelers historically don’t move on from coaches, but I think it’s time that history be made.”Mike Tomlin won a Super Bowl in his second season coaching the Steelers. However, it's been mostly mixed ever since.The Steelers last made it past the wildcard round in the 2016 season. They won two games but ultimately lost to the New England Patriots in the AFC Championship Game. Since then, they've been eliminated at the first hurdle every year they have made the playoffs.Tomlin's troops trail the Baltimore Ravens on a tiebreaker and need to raise their level to win the AFC North.Mike Tomlin's Steelers face off against the Ravens in Week 14The Steelers travel to Baltimore to face the Ravens in Week 14, hoping to bounce back from a disappointing loss to the Buffalo Bills in Week 13.The Steelers have lost three of their last five games. In contrast, the Ravens have lost just one out of their last five, enabling John Harbaugh's team to close the gap at the summit of the division.