The Chinese government espionage campaign that has deeply penetrated more than a dozen U.S. telecommunications companies is the “worst telecom hack in our nation’s history — by far,” a senior U.S. senator told The Washington Post in an interview this week.

A breach of telecoms companies that the United States said was linked to China was the "worst telecom hack in our nation's history - by far," the chairman of the Senate Intelligence Committee told the Washington Post on Thursday.

Chinese-linked hackers have reportedly executed the most significant breach of US telecom history, compromising sensitive surveillance data meant for law enforcement agencies. The attack, which Beijing denies,