Special Counsel Robert Mueller brought the charges against Donald Trump's former campaign manager Paul Manafort as part of a wide-ranging probe into Russian interference in the 2016 election.

Manafort and Gates were charged on counts ranging from fraud to conspiracy, but it was the evidence made public Monday against George Papadopoulos that revealed ties between Trump’s inner circle and Russia.

One of Robert Mueller’s prosecutors, Aaron Zelinsky, also hinted at the possibility of more to come.