Tom Steyer spent about $1 million on political ads in the first four primary and caucus states on Tuesday – the same day he launched his bid for the 2020 Democratic nomination, according to a report.

The California billionaire, who’s been waging a national campaign to impeach President Trump, bought $1.05 million worth of broadcast ads in the biggest cities in Iowa, Nevada, and South Carolina, as well as Boston, which covers New Hampshire, NBC News reported, citing data provided by Advertising Analytics.

Steyer has vowed to spend $100 million of his own money to support his presidential campaign.