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WATCH: Senate holds hearing on SolarWinds hack

Technology company leaders at SolarWinds and Microsoft testified before the Senate on Tuesday about major cyberattacks to the United States government and corporations.

The hearing is scheduled to start at 2:30 p.m. ET. Watch in the player above.

U.S. officials are scrambling to reinforce the nation’s cyber defenses following a sweeping hack that may have exposed government and corporate secrets to Russia. Hackers hijacked widely used network software from SolarWinds Inc. to install malicious software through what appeared to be a routine security update.

President Joe Biden has said that dealing with “Russian recklessness and hacking into computer networks in the United States and across Europe and the world has become critical to protecting our collective security.”

WATCH: Assessing the damage from the recent U.S. cyberattack

Asked about reports the White House is close to sanctioning Russia for both the SolarWinds hacking attack against the U.S. government as well as the poisoning of opposition leader Alexei Navalny, Psaki said the review into potential actions is still underway, but she said the administration will make a decision within “weeks, not months.”