Get breaking news alerts and special reports. The news and stories that matter, delivered weekday mornings.

DES MOINES — Billionaire Tom Steyer, a major Democratic donor who has led a crusade to impeach President Donald Trump, said Wednesday that he will not seek the party's 2020 presidential nomination.

The news was first reported by The New York Times and confirmed by NBC News. He was set to make the announcement in Iowa.

The impeachment question has reached an inflection point. That’s why I just announced that I will be dedicating 100% of my time and effort in 2019 towards Mr. Trump’s impeachment and removal from office. — Tom Steyer (@TomSteyer) January 9, 2019

A California billionaire and former hedge fund chieftain, Steyer is one of the Democratic Party's most prominent donors and a major champion of climate change action. In recent months, he has focused his efforts on "Need to Impeach," his group aimed at building momentum to impeach Trump.

Let our news meet your inbox. The news and stories that matters, delivered weekday mornings. This site is protected by recaptcha

"I will do whatever it takes, for as long as it takes, to remove a president," Steyer told reporters on Wednesday. "Not because I disagree with his policies…but because the people must do what our elected officials have been unable and unwilling to do: Hold President Trump accountable."

Instead of running, Steyer said he is "strengthening my commitment to 'Need to Impeach' in 2019 until the House starts proceedings or Mr. Trump resigns. That’s how we will define success."

Asked after his announcement by NBC News who among possible 2020 Democrats would pick up that impeachment mantle, Steyer said it would be premature to say because he didn't know yet how the field is shaping up.

Steyer said he will spend at least $40 million on those impeachment efforts over the next year.

Steyer was one of a few wealthy businessmen who are considering seeking the Democratic nomination. The others are former New York City Mayor Michael Bloomberg and Starbucks founder Howard Schultz.

Ali Vitali reported from Des Moines and Allan Smith from New York City.