Billionaire climate activist Tom Steyer and the service workers' union teamed up Friday to announce a new $10 million campaign to defeat GOP presumptive nominee Donald Trump.

Steyer's group, NextGen Climate, teamed up with the Service Employees International Union in the latest push by a union and environmentalists to take down Trump and elect Hillary Clinton.

Steyer late Thursday blasted Trump's pick for vice president, former Indiana Gov. Mike Pence, calling the choice an affront to the lesbian and gay community.

"Mike Pence rose to national prominence with his support of an anti-LGBT bill in Indiana," Steyer said. "Now Donald Trump has resurrected his career, reaching to the very bottom of the apple barrel to find someone to match his own record of intolerance and bigotry."

The campaign push will be focused on Latino, African-American and Asian voters in a number of swing states, including Ohio, where the Republican National Convention is being held next week.

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