An advisory says that foreign agencies are posing as consulting firms, think tanks and other organizations to connect with former government employees.
The hearing opened with unruly scenes as hecklers forced the justices to halt the proceedings and then to resume them without a public audience. The government was handed a deadline to find a compromise.
Dozens of employees who had been working to fight foreign interference in U.S. elections have been reassigned or forced out, according to current and former officials.