"Witch Hunt." Also, reports have emerged that the senior Justice Department official has privately acknowledged to colleagues that he may have to recuse himself from his role overseeing the special counsel probe into Russian meddling in 2016 elections, which he took charge of only after Attorney General Jeff Sessions' own recusal.
In a tweet, the president also seemed to accuse the U.S. deputy attorney general of pursuing a "Witch Hunt".
Moreover, the Senate intelligence committee has already grilled several high-ranking officials - including Director of National Intelligence Dan Coats, National Security Agency Director Mike Rogers and Attorney General Jeff Sessions - about whether Trump sought to interfere with the Russian Federation investigation and the criminal probe into his former national security adviser, Michael Flynn.
In an interview with NBC's Lester Holt in May, Trump said he made the decision to fire Comey before receiving Rosenstein's letter. Now there's some question of whether President Trump wants to fire Mueller.
Trump has denied any involvement with the Russians during the campaign and has called media reports of collusion a "hoax" and a "phony story".
Trump friend says the president is considering firing special counsel Mueller
Senate GOP rivals spar in radio appearances MORE's presidential campaign PAC Hillary for America, according to FEC reports. As a legal matter, it would be unprecedented for the president to fire a special counsel on his own authority.
In a tweet earlier Friday, Trump said nobody has been able to show any proof about his collusion with Moscow after months of investigations. A spokesman for Mueller declined to comment for the Guardian, and a spokesman for Trump's lawyer did not respond to a request for comment.
Concerns that Trump may have tried to obstruct justice are based partly on testimony from Comey before a Senate panel on June 8. Each time Comey says he told the president "no".
"Why is [it] that Hillary Clintons [sic] family and Dems dealings with Russian Federation are not looked at, but my non-dealings are?"
Comey said the notes contain his recollections that Trump asked for his loyalty when they met for a January dinner and then urged him during a private meeting in the Oval Office two weeks later to drop an investigation into former National Security Adviser Michael Flynn.
The Twitter attacks came as Vice-President Mike Pence hired a personal lawyer to represent him in the intensifying investigation.
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