Except in the context he is speaking of, extremely few Americans have more than one company supplying them with Internet access. It is definitionally a monopoly, and to say existing anti-trust legislation is sufficient is saying the monopolies as they exist now are acceptable and nothing needs to be done.

It is a dismissive comment from the senator, he should feel insulted. It is like saying "help I'm bleeding" and the guy next to you saying "its not that bad, get over yourself".