Final answer:
Caesar claimed Catiline was conspiring to overthrow the government and assassinate some senators, framing himself as a protector of rights and opponent of Senate corruption.
Step-by-step explanation:
Julius Caesar claimed that Lucius Sergius Catilina (Catiline) had planned a conspiracy to overthrow the Roman government and assassinate certain senators. He alleged this during his time as a consul and took steps to address the threat posed by Catiline and his followers. Caesar, a clever politician, used the situation to present himself as both the champion of his troops and the common people of Rome.
By promising to aid against the Senate's corruption, he cleverly posed as a guardian of legal rights and the fighter against endemic corruption, despite accumulating power which eventually led to conflicts with the Senate and his assassination.