In a tweet Mayor Lightfoot said, "Several months ago I was cut from a debate of the "frontrunner" candidates and public polls had me at 3 percent. Today I am Mayor of Chicago. To all the Democrats running for President, I say this: if you are running for the right reasons, never stop fighting."
Three candidates failed to meet the polling and fundraising measures.
The DNC will host two days of debates in Miami later this month.