KEY POINTS
  • Billionaire former presidential candidate Mike Bloomberg will be speaking at the Democratic National Convention as party leaders wonder when he will start spending big to back Joe Biden's campaign.
  • A convention official told CNBC that Bloomberg plans to target President Donald Trump in his speech and specifically go after his handling of the coronavirus pandemic.
  • "My sense is that he is supportive but not yet fully engaged," a friend of Bloomberg's told CNBC, regarding his lack of financial support so far. "Lots of verbal shrugging," said another. 
Democratic presidential candidate former New York City mayor Mike Bloomberg waves to his supporters at his Super Tuesday night event on March 03, 2020 in West Palm Beach, Florida.

Billionaire former presidential candidate Mike Bloomberg is set to speak at the Democratic National Convention next week as party leaders wonder when he will start spending big to back Joe Biden's campaign for president. 

A spokeswoman for Bloomberg confirmed to CNBC that he will be a featured speaker at the virtual convention that's slated to start on Monday. Bloomberg, a former mayor of New York, has been a vocal supporter of Biden's since his own withdrawal from the Democratic primary in March.