(CNN) President Donald Trump Sunday would not say whether he will pardon several former associates who were convicted after being charged as part of the Mueller probe, including former campaign chairman Paul Manafort and long-time friend Roger Stone.

When asked about pardons at the coronavirus task force briefing , Trump responded: "You will find out."

Trump also harshly criticized FBI officials for how they conducted the investigation of whether Russia was trying to interfere in the 2016 election, which the bureau started before Special Counsel Robert Mueller took it over.

The President called FBI officials involved in the Russia investigation "human scum" in the briefing because he believes the lives of several of his friends and colleagues were unnecessarily ruined because of the probe.

The Justice Department's inspector general, in a broad review of the start of the FBI's Russia counterintelligence investigation, found the investigation was opened properly but that the FBI made serious errors in its observations of Trump political associates.

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