(CNN) Joe Biden's presidential campaign says President Donald Trump is "lying about the one Democrat he doesn't want to face" in the first new spot to be included in the former vice president's $6 million broadcast and digital advertising push across the four early-voting states.

The ad is geared to show a Democratic audience that Biden, who polls show battling Sens. Elizabeth Warren of Massachusetts and Bernie Sanders of Vermont at the top of the polls, is the most electable candidate -- or at least the one Trump fears the most -- in the party's 2020 field.

It is also a response to the Trump campaign's ads in early states that include false claims about Biden, his son and Ukraine and hit Democrats for beginning impeachment proceedings over Trump's effort to pressure the Ukrainian President to investigate the Bidens. There is no evidence of wrongdoing by either Biden in Ukraine.

The Trump campaign is doing an ad blitz in the same four states starting this weekend, going after Biden. The Biden-focused ad buy totals more than $1 million, campaign communications director Tim Murtaugh confirmed to CNN. That buy is part of an overall $10 million buy from the campaign and Republican National Committee.

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