President Donald Trump is seething because of media reports that special counsel Robert Mueller has persuaded a grand jury to issue at least one indictment in the investigation of alleged abuses by members of Trump's 2016 presidential campaign.

Trump's frustration and anger came through in a series of weekend tweets. "All of this 'Russia' talk right when the Republicans are making their big push for historic Tax Cuts & Reform. Is this coincidental? NOT," Trump wrote on Twitter Sunday. He also tweeted, "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 [from Clinton's email server] the Comey fix and so much more. Instead they look at phony Trump/Russia 'collusion,' which doesn't exist."

He was referring to 2016 Democratic presidential nominee Hillary Clinton and her campaign's alleged involvement in paying for research into negative allegations against Trump. Another reference was to allegations that Hillary Clinton's family foundation received donations in exchange for her support as secretary of state for a business arrangement that gave Russia control over a portion of uranium production in the United States. Still another reference was to James Comey, whom Trump fired as FBI director while he was head of an investigation into the Trump campaign and Russia.

Trump had been planning a series of major announcements this week, including revealing the details of Republican tax-cut legislation and choosing the chair of the Federal Reserve. He is also set to begin a 12-day trip to Asia on Friday.

But Mueller is poised to crowd out news coverage of these stories as he continues investigating Russia's alleged meddling in the U.S. election and whether Russians colluded with the Trump campaign to undermine Clinton.