Sanders to Bloomberg: You're not going to buy this election

Sen. Bernie Sanders had a message for new Democratic presidential rival, billionaire Mike Bloomberg, during the Climate Crisis Summit at Drake University in Des Moines, Iowa, Saturday: "You're not going to buy this election."

Why it matters: A Bloomberg source told Axios, "Mike will spend whatever it takes to defeat Donald Trump."

• Fellow Democratic candidate and billionaire Tom Steyer has spent more than any other 2020 hopeful to self-fund his campaign — allowing him to meet the increasingly strict qualifications for presidential debates.

We don’t have a super PAC and I’m not worth $52 billion."

The big picture: Per Fox News, Sanders' campaign is using moderate Bloomberg's bid to enter to the race as a a fundraising point, saying in an email to supporters,"Did you see the news? Mike Bloomberg is filing paperwork to run for President of the United States. Just what America needs... another billionaire using his wealth to try to buy an election."

Go deeper:

• 2020 presidential election: Track the candidates
• What you need to know about the 2020 presidential candidates