California voters will consider a controversial proposal in November to temporarily raise taxes on billionaires after the labor union backing the measure announced Thursday it would forge ahead despite pressure from critics to withdraw it.

Californians will vote in November on a controversial proposal to impose a one-time tax on billionaires to help fund federal funding cuts to healthcare for low-income people.

Proposal to introduce one-time tax of 5% will go to voters in November after backers decline to withdraw measure

The ballot measure will decide if California will impose a one-time 5% tax on its billionaire residents, an idea that has been controversial.