Democratic presidential nominee Hillary ClintonHillary Diane Rodham ClintonDavis: The shocking fact that Mueller never would have accused Trump of a crime Trump says he would challenge impeachment in Supreme Court The Hill's Morning Report - Will Joe Biden's unifying strategy work? MORE on Sunday released a video questioning Republican counterpart Donald TrumpDonald John TrumpDemocrats' CNN town halls exposed an extreme agenda Buttigieg says he doubts Sanders can win general election Post-Mueller, Trump has a good story to tell for 2020 MORE's ties to Russia.

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Onscreen text at the beginning of the video says "We don't know why Trump praises Putin," before showing a clip of Trump calling the Russian president a "strong leader" and pushing back against criticism of Putin.

A clip then shows "Morning Joe" host Joe Scarborough saying that the GOP nominee always "seems to upend American foreign policy tradition in a way that benefits Vladimir Putin."

The video highlights several of Trump's proposals, including his calling NATO "obsolete" and pointing to a Washington Post article from last month titled "Trump Campaign Guts GOP's Anti-Russia Stance on Ukraine."

The video also mention's Trump campaign chairman Paul Manafort's ties to a former pro-Putin prime minister in Ukraine.

It then references the trove of emails released by WikiLeaks last month that show top officials at the Democratic National Committee apparently planning how to undermine Bernie SandersBernard (Bernie) SandersDemocrats' CNN town halls exposed an extreme agenda Buttigieg says he doubts Sanders can win general election Meghan McCain: Bernie Sanders supporting prisoners being able to vote 'bats**t insane' MORE's presidential campaign. Experts believe the hack was likely the work of Russian intelligence agents.

"Russia if you're listening, I hope you're able to find the 30,000 emails that are missing," Trump says in the video, a reference to the messages Clinton deleted from the private server she used when she was secretary of State. Trump later walked back that invitation, saying he was being "sarcastic."

Several news anchors are shown in the video questioning whether Trump's refusal to release his tax returns has anything to do with his ties to Russia.

"We don't know what's going on here, and Donald won't tell us," text says at the end of the video.

"We'll let you guess."