Why liberal billionaire Tom Steyer thinks he can get Trump impeached

“Wacky and totally unhinged” is how President Trump described California billionaire Tom Steyer on Twitter. It’s likely that Trump caught one of Steyer’s ads calling for the president’s impeachment. Steyer is one of the biggest donors to Democratic candidates in the country, and is rumored to be considering a Senate run against Dianne Feinstein. How much political power does he really have?