The senate was afraid of the extent the power of Julius Caesar. Militarily, with his conquest of Gaul he became the commander of seven legions (army corps). This was a force which was very difficult to match, especially in term of quality. Many of Caesar's soldiers were battle hardened veterans of the Gallic Wars.
Politically, Caesar was tremendously popular with the middle and lower classes of Rome. This was because he was a popularis. The populares (plural) was a political faction which championed the cause of the poor and tried to introduce reforms to help them. It was opposed by the optimates, a conservative political faction which favoured the aristocracy and opposed reforms. The power base of the optimates was the senate. The optimates were unpopular with the masses because they opposed reform and they were seen as the representatives of an aristocracy which was seen as corrupt. Caesar was seen as the hero of ordinary people and the poor. His prestige had been further enhanced by his success in Gaul.
The senate was afraid that Caesar would use his armies and his popularity to seize power and to implement reforms.
Read Shakespeare's "Julius Caesar"
He was supposed to be there. All of the Caesars were supposed to be at the senate meetings
he was stupid in not relinquishing some of his power. He was felt to be a threat because of his authoritative manner of doing things and his disrespect for, and ignoring of, the senate.
Trebonius.
mark Antony
greed and a thirst for power
Gh
Senate
on whom does Cassius blame caesars power
with the Senate
Senate!
Caesar was warned not to, however, to not go would appear to be a sign of weakness.