The U.S. Treasury Department proposed a rule Thursday to crack down on American high-tech investments such as supercomputing and artificial intelligence in China, Russia, North Korea and other "countries of concern."

Collins, locked in a tight race with Democratic challenger Troy Jackson, issued a statement saying she'd spoken with Trump's top trade negotiator, Jamieson Greer, and Commerce Secretary Howard Lutnick "about the toll tariffs are taking on Maine families, businesses, farmers, and growers.''

So far this year, claims have remained at historically low levels, never topping 230,000 in a single week.

The fines on America's second-biggest bank amount to the third-largest in the department's history.