Why did the senate order Caesar to break up his legions?

The Senate ordered Julius Caesar to break up his legions primarily due to concerns over his growing power and the potential threat he posed to the Republic. They feared that Caesar's military command could enable him to challenge their authority and establish a Dictatorship. By disbanding his legions, they aimed to weaken his influence and ensure he returned to Rome as a private citizen rather than a military leader. This request ultimately contributed to the tensions that led to civil war.