A super PAC backing former Vice President Joe Biden’s presidential campaign on Saturday blasted negative ads against Biden in early primary states as an attempt by President Trump to sabotage him before he can benefit from key Democratic constituencies, according to Politico.

“Trump is spending considerable sums in the early states, particularly Iowa, in a hope to stop Biden’s momentum before he can get to the states where his coalition works to his benefit,” Democratic strategist Steve Schale wrote in a memo, according to the publication.

{mosads}“Trump’s digital advantage has been well documented, and just this week alone, the Trump campaign spent $250,000 in negative ads in Iowa and Nevada. He wants to choose the nominee, and we aren’t willing to let that happen,” Schale added.

The memo specifically points to Biden’s polling strength in South Carolina, the first contest involving significant numbers of African American voters, as well as Nevada, the first with a significant Latino population.

“Much like Secretary Clinton did after Iowa and New Hampshire, there is a very real path for Biden to get on a run to roll up delegates in the contests that come in the 6 weeks following New Hampshire,” the memo states, according to Politico.

The Biden campaign is reportedly basing its strategy around the possibility the former vice president will lose the Iowa caucuses, where a recent poll found Sen. Elizabeth Warren (D-Mass.) in first place and Biden in fourth behind Sen. Bernie Sanders and South Bend, Ind. Mayor Pete Buttigieg.