Hillary Clinton said President Trump "had to know" people working for him were reaching out to Russian operatives to help his 2016 presidential election prospects.

Following news of the first indictments in special counsel Robert Mueller's Russia probe, Clinton complained that Trump has let the Russians go with few consequences, despite the Kremlin waging a "cyber warfare" against the U.S.

"I think that's, in large measure, because the president is so ambivalent," Clinton told "Daily Show" host Trevor Noah on Wednesday. "I mean, he has to know — we'll find out what he knew and how involved he was — but he had to know that people were making outreach to Russians, to the highest levels of the Kremlin in order to help him, to hurt me, but more importantly to sow this divisiveness."

Mueller's office announced Monday that a federal grand jury indicted Paul Manafort, Trump’s former campaign chairman, and his former business associate, Rick Gates, on 12 counts, including conspiracy against the U.S.

On the same day it was revealed George Papadopoulos, a foreign policy adviser to Trump's campaign, pleaded guilty in early October to lying to the FBI about his communications with Russian contacts.

Trump's campaign is being investigated for possible collusion with the Kremlin, though the president says the whole Russia inquiry is a "witch hunt."

Clinton also told Noah that "most serious people understand" there is a difference between her campaign team paying for opposition research versus Trump's people working with the Russians to influence the 2016 election.