The supply chain review is a matter of economic and national security, the president said.

SolarWinds' Sudhakar Ramakrishna said his company is still investigating the scope of the attack.

Hackers leveraged networks that are outside investigators' jurisdication, said Anne Neuberger, Deputy National Security Advisor for Cyber and Emerging Technolog.

A recent poll found that 7 of 10 Republican voters believe Joe Biden was not legitimately elected.

The Trump administration's actions against the two companies should be reviewed as part of a more "comprehensive strategy" on Chinese use of U.S. data and intellectual property, the White House said.

He'll become senior director of cyber for the incoming president.