(CBSNews) -- President Donald Trump appeared to criticize investigations into Russian meddling in the 2016 U.S. election and any possible ties to the Trump campaign in a string of tweets on Sunday.

"The Dems are using this terrible (and bad for our country) Witch Hunt for evil politics, but the R's... are now fighting back like never before," he tweeted.

He kicked off the series of tweets by posting: "Never seen such Republican ANGER & UNITY as I have concerning the lack of investigation on Clinton made Fake Dossier (now $12,000,000?), the Uranium to Russia deal, the 33,000 plus deleted Emails, the Comey fix and so much more."

He went on, writing, "Instead they look at phony Trump/Russia... 'collusion,' which doesn't exist."

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