President Donald Trump accused Robert Mueller of “threatening” witnesses to cooperate in the probe into Russian meddling in the U.S. presidential election, one day after the Senate’s Republican leader blocked a bid to protect the special counsel’s work.

“The inner workings of the Mueller investigation are a total mess. They have found no collusion and have gone absolutely nuts,” Trump said on Twitter Thursday. “They are screaming and shouting at people, horribly threatening them to come up with the answers they want.”

Trump provided no examples.

Trump then launched a blistering attack on the probe, accusing Mueller by name of being “highly conflicted” and saying he worked for former President Barack Obama “for 8 years.” Mueller was appointed as FBI director by former President George W. Bush and Obama later extended his original 10-year-term by two years until 2013.

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