Trump's former White House communications director said he'd campaign for Joe Biden if asked to.
"Like when you chock on your covfefe?" one person fired back online.
The Minnesota senator reportedly plans to endorse Joe Biden.
After a report revealed his campaign exploited prison labourers to make calls on his behalf, Bloomberg said he's no longer working with the company that hired them.
The former New York City mayor has pitched himself as the candidate to beat Donald Trump. His rivals were determined to prove him wrong.
The democratic socialist is assembling a broad coalition of voters.
Former vice president Joe Biden is in a surprising fourth place after limited results released.
CNN released the audio of both 2020 presidential candidates saying the other called them a "liar" on national television.
Sanders denied the 2018 exchange, which was first reported by CNN.
In a mid-August editorial, the Houston Chronicle encouraged the former Texas congressman to run for senate instead.