China said the move 'deliberately undermines China-U.S. relations' and threatened retaliation.
The hackers were helped by China's Ministry of State Security, authorities said.
State Republicans called on House Speaker Mike Madigan to resign if the allegations prove true.
Google, Apple, Microsoft and Yahoo 'all too willing to collaborate,' Attorney General William Barr said.
Pandemic-related lockdowns may have affected the ways Democrats usually sign up voters.
Weiss resigned after three years over what she said was "constant bullying."
Tribes can't punish violent felonies with more than 3 years in prison, while state can't prosecute tribal members at all.