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President-elect Donald Trump was busy online over the weekend, taking swipes at the Director of the CIA and a Congressman.

FOX's Rachel Sutherland reports from Washington:

The President-elect suggested outgoing CIA chief John Brennan leaked an unsubstantiated and unflattering dossier. He also said he couldn't do much worse on dealing with Russia's aggression's, pointing to the crossed red line in Syria and a build-up of Russian nukes.

The tweets came in response to Brennan's appearance on "FOX News Sunday":

(Brennan) "I don't think he has a full appreciation of Russian capabilities, Russia's intentions and Russia's actions."

Mr. Trump also scrapped with Congressman John Lewis, after the civil rights icon called him an illegitimate president.

Lewis says he's not going to the swearing-in and nearly 30 other House Democrats are also not going.

In Washington, Rachel Sutherland, FOX News.

Follow Rachel Sutherland on Twitter: @SutherlandFOX