"I'm very grateful to the police and post office for doing such a great job," Steyer said. "Very grateful for them keeping everybody safe."
RELATED: Mail bomb suspect Cesar Sayoc left trail of social media posts, past arrests
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The suspicious package containing an explosive device was discovered Friday morning at a Burlingame postal facility on Rollins Road. The postal facility was evacuated and authorities transported the device to the police gun range near San Francisco International Airport where it was rendered safe. No one was hurt.
Police believe it was sent by suspected mail bomber Cesar Sayoc.
RELATED: Mail bomb device addressed to Democrat billionaire Tom Steyer intercepted in Burlingame
When asked if he was surprised a device was sent to him, Steyer answered, "I really don't understand what this guy was up to."
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Steyer, an outspoken critic of Donald Trump, also blasted the president on CNN on Friday.
"He does not understand that in a civil society the kind of rhetoric that he uses, his attacks on the press, are absolutely wrong," Steyer said.
RELATED: Sacramento officials say suspicious device addressed to Sen. Kamala Harris rendered safe
The same dramatic scene also played out in Sacramento on Friday, after a postal worker discovered a suspicious package addressed to U.S. Sen. Kamala Harris, D-Calif. The post office was evacuated and neighbors were told to shelter in place.
The FBI confirmed the device was similar to a dozen others sent to prominent Democrats and CNN.
"Thankfully nobody was hurt and that's my first priority," Sen. Harris said. "There are powerful forces...that have been sowing hate and division among us."
The FBI warns there could be more devices out there.