White House lawyer Ty Cobb said Sunday the president’s tweets calling an inquiry into his ties with Russia a “witch hunt” and calling for an investigation into Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense MORE are not a reaction to special counsel Robert Mueller’s ongoing probe.

“His tweets today are not, as some have asked, a reaction to anything involving the special counsel with whom the White House continues to cooperate,” Cobb told NBC News.

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Trump lashed out Sunday morning in a series of tweets, calling allegations that he colluded with Russia “phony.” He then called for Congress to “DO SOMETHING” about, among other things, Clinton’s ties to a dossier of unverified allegations about Trump.

Soon after, he suggested talk of the investigation into Russian interference in the election was timed intentionally to overshadow Republican efforts to push for tax reform.

CNN reported Friday that a federal grand jury has approved the first charges in Mueller’s investigation.

Former U.S. Attorney Preet Bharara told CNN on Sunday that Mueller may look at how Trump reacts to news surrounding the special investigation as the probe continues.