It also appears that each evolution in investigative sophistication very almost moves in lock-step with the outbreak of additional revelations indicating undisclosed meetings and questionable associations between those within President Trump's immediate orbit and affiliates of the Kremlin. Meanwhile, legislation introduced to the Senate by Thom Tillis, a Republican, and Chris Coons, a Democrat, aims to make it harder for Trump to fire Mueller.
Mueller and Comey - who was investigating the Russian interference before he was sacked by Trump - had worked closely together since at least 2003.
Earlier this week, Reuters reported that Mueller, who was appointed special counsel in May, brought a former U.S. Justice Department official to join his investigative team.
In the event of removal, a three-judge panel would hear the court challenge within 14 days of the action.
Mueller was appointed as special counsel in May following the firing of James Comey as Federal Bureau of Investigation director.
10 key takeaways from RBI's third bi-monthly Monetary Policy Statement
Following the decision, the benchmark repo rate stands reduced to 6 percent from 6.25 percent earlier. The Committee was formed during a year ago on the lines of Federal Open Market Committee in the US.
Now, recently, Mr. Comey has testified under oath before a Congressional Committee that he deliberately caused information to be leaked for the objective of causing a special counsel to be appointed.
He is citing what he says is a conflict of interest because of Mueller's "close friendship" with fired FBI Director James Comey.
Trump has even explicitly tried to limit the investigation by warning Mueller in the media not to go after his financial interests. This new jury suggests that Mueller's investigation is headed in a different direction and may be larger.
The probe is apparently separate from the grand jury that was empaneled in Alexandria, Va., in connection with the investigation of former National Security Adviser Michael Flynn.
Coons added: "Ensuring that the special counsel can not be removed improperly is critical to the integrity of his investigation". The fact that a Senate Republican is formally supporting Mueller over his party's president, though, is still significant-and Trump will nearly certainly interpret it as a personal betrayal requiring personal retaliation.