An invitation says the New York event for Bredesen next Tuesday costs $5,000, $2,700 or $1,000 per person. Bredesen faces Republican Congresswoman Marsha Blackburn.
The Bloomberg fundraiser is drawing outcry from Republicans because the billionaire is a leading gun control advocate.
Bredesen has touted his "A'' NRA rating as governor, though the NRA now says he's "D'' rated. Bredesen disagrees with the NRA on issues like supporting universal background checks.
Bredesen campaign spokeswoman Alyssa Hansen responded by lamenting negative ads from Blackburn and GOP-friendly groups. Democratic interests are likewise spending big to attack Blackburn.
Blackburn drew President Donald Trump to Tennessee for a fundraiser Monday at $10,000 or $25,000 per couple and a public rally.
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