The hearing is the latest development in what’s become a political football in Washington.
Advertisers know they have a direct line to Trump through Fox News.
The measure applies to both landline and wireless telephone systems, but political organizations, pollsters and survey takers are exempt.
Open-source software lets operators make thousands of phone calls with the click of a button, he told U.S. senators.
Some skeptical lawmakers called for social-media regulation.
The case involves the mother of all robocall spoofing schemes.
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