The Trump campaign had already announced an $8 million national TV buy centered on impeachment and the Ukrainian matter. Of that total, slightly over $1 million will now be directed to the four early voting states, where Biden is locked in a competitive battle for the Democratic nomination.

“Joe Biden promised Ukraine $1 billion if they fired the prosecutor investigating his son’s company,” says the ad, titled “Biden corruption.”

“Voters should know about the self-dealing, influence-peddling Bidens as the campaign season progresses,” said Tim Murtaugh, a Trump 2020 spokesman.

A spokesperson for Biden did not immediately respond to a request for comment. The Wall Street Journal reported Thursday that Biden, to counter Trump's Ukraine attacks, is planning his own $6 million ad campaign in Iowa, New Hampshire, Nevada and South Carolina.

The Trump campaign has already begun airing the Biden-focused spot nationally. On Thursday, the Biden campaign sent a letter to Fox News demanding it not run the commercial. The campaign claims it "spreads false, definitively debunked conspiracy theories.”

“Though the Trump campaign is prepared to fabricate outright lies, your station’s airwaves should not be used to disseminate them,” Biden campaign manager Greg Schultz wrote in the letter. “We are putting you on notice about the absolute falsity of the advertisement’s claims, and we expect that you will reject it."

CNN said Thursday it wouldn’t air the ad, according to The Daily Beast.

The Trump campaign is capitalizing on its massive bank account to go after Biden more than a year before the general election. The president's campaign and the Republican National Committee announced this week they had raised a combined $125 million during the third quarter of the year.

Biden has emerged as the top Democratic target of the Trump campaign. Many of the president’s top allies think he would be Trump’s most formidable general election opponent. Polling has consistently shown Biden ahead of Trump in critical Rust Belt states like Michigan, Wisconsin and Pennsylvania, each of which the president won in 2016.

By going after Biden, the Trump team hopes to pave the way for another Democrat to win the nomination. Those close to the president would prefer to run against a more liberal candidate, such as Elizabeth Warren or Bernie Sanders.

Biden has aggressively pushed back against the president. During an appearance in Nevada on Thursday, the former vice president accused Trump of "repeatedly smearing me and my family."

The president, Biden said, "imagines that this tactic will allow him to pick his opponent and face only the candidates he thinks he can beat.”