The ad, above, has been on YouTube since October 19 (as of his writing it's racked up more than 800,000 views) and San Francisco-based Steyer, who made his fortune as a hedge fund manager and has backed various Democratic candidates, previously announced that he intends to spend $10 million placing it on TV.
He added that Steyer "has been fighting me and my agenda Returning Greatness to America from the very beginning", adding that the billionaire environmentalist "never wins elections!" "Now for biggest Tax Cuts", Trump wrote.
The billionaire has thus vowed to spend at least $10 million in advertising which has been running on Fox News and other national outlets calling for the president's impeachment.
Steyer is a former hedge fund manager-turned-environmental activist who is one of the Democratic Party's biggest donors, pouring tens of millions of dollars of his own money into grassroots voter outreach operations and recent campaigns of several Democrats, including Hillary Clinton's a year ago. Brad Sherman of California, Al Green of Texas and Waters also have called for the president's impeachment. Alas, he caught Trump's eye, perhaps because the ad was featured on The Donald's favored "Fox & Friends" show.
The billionaire wants people in the United States to call their representatives in Congress and ask them to "prosecute the president", says Tom Steyer.
Trump's tweet on Friday is likely to bring more attention on Steyer's campaign.
Steyer himself has not ruled out a run for political office, including possibly a challenge to Senate incumbent Dianne Feinstein in 2018 or a presidential run in 2020.