Witnesses at a recent Senate hearing who testified about antifa’s role in stirring aggressive protests and riots in Portland, Oregon, say their call for federal action may be ignored due to process issues in the proceeding that left Senate Democrats fuming.

Sen. Ted Cruz, a Texas Republican, on Tuesday, led the three-hour hearing of his judiciary subcommittee, “The Right of the People Peaceably to Assemble: Protecting Speech by Stopping Anarchist Violence.” The hearing aimed to explore violence erupting from riots in cities around the country, particularly in Oregon’s largest city.