Clinton team attacks Trump on Russia

Hillary ClintonHillary Diane Rodham ClintonSanders supporters cry foul over Working Families endorsement of Warren The Hill's 12:30 Report: Trump heads to California Hillary Clinton: Voter suppression has led to 'crisis in democracy' in the US MORE's presidential campaign is attacking Donald TrumpDonald John TrumpBusiness, ballots and battling opioids: Why the Universal Postal Union benefits the US Sanders supporters cry foul over Working Families endorsement of Warren California poll: Biden, Sanders lead Democratic field; Harris takes fifth MORE on Russia ahead of his foreign policy speech set for Monday, calling for him to disclose any connections that exist between Russia and aides to the Republican nominee.

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"On the eve of what the Trump campaign has billed as a major foreign policy speech, we have learned of more troubling connections between Donald Trump's team and pro-Kremlin elements in Ukraine," campaign manager Robby Mook said in a statement late Sunday night.

"Given the pro-Putin policy stances adopted by Donald Trump and the recent Russian government hacking and disclosure of Democratic Party records, Donald Trump has a responsibility to disclose campaign chair Paul Manafort's and all other campaign employees' and advisers' ties to Russian or pro-Kremlin entities, including whether any of Trump's employees or advisers are currently representing and or being paid by them."

Mook's call comes after a New York Times investigation was published Sunday night that looks into Manafort's time consulting for Ukraine's pro-Moscow political party.

The investigation showed that Manafort has ties to a large network that Ukrainian government investigators say was used to loot assets and influence elections.

Manafort's ties to the region have come under increased scrutiny recently amid accusations of Russian hackers attacking the Democratic National Committee.

The New York Times said its report "offers new details of how [Manafort] mixed politics and business out of public view and benefited from powerful interests now under scrutiny by the new government in Kiev."

The story created a stir on Twitter when Trump's former campaign manager Corey Lewandowski tweeted a link to the article minutes after it was posted.

In the past, critics have accused Trump of sympathizing with Russia, pointing to the candidate's praise of Putin.

Trump has disputed claims that he has any financial ties to Russia.