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US President Donald Trump has been warned by fellow Republicans against interfering special counsel Robert Mueller's investigations.
It came after he attacked Mr Mueller's inquiry into Russian interference in the 2016 US presidential election.
In tweets at the weekend, Mr Trump reiterated that there had been "no collusion" between his team and Russia and called the probe a "witch hunt".
He added that it was dominated by "hardened Democrats".
Mr Mueller, a highly regarded former head of the FBI, is a Republican.
Republican Senator Lindsey Graham said Mr Mueller should be allowed to proceed without interference, and that many Republicans shared his view.
He also warned Mr Trump against any attempt to dismiss Mr Mueller.
"If he tried to do that, that would be the beginning of the end of his presidency, because we're a rule of law nation," Mr Graham said.
Republican Senator Jeff Flake, a frequent Trump critic, said it appeared the president's latest comments seemed to be preparing the ground for the firing of Mr Mueller.
"I don't know what the designs are on Mueller, but it seems to be building toward that, and I just hope it doesn't go there... We can't in Congress accept that," he told CNN.
"I'm just puzzled by why the White House is going so hard at this, other than that they're very afraid of what might come out."
AshLee Strong, a spokeswoman for the Republican Speaker of the House of Representatives, Paul Ryan, said: "As the Speaker has always said, Mr Mueller and his team should be able to do their job."
Senate Democratic Leader Charles Schumer accused Mr Trump of "floating trial balloons about derailing" the investigation.
"Our Republican colleagues, particularly the leadership, have an obligation to our country to stand up now and make it clear that firing Mueller is a red line for our democracy that cannot be crossed," he said in a statement.
The president said in a tweet on March 18, “Why does the Mueller team have 13 hardened Democrats, some big Crooked Hillary supporters, and Zero Republicans? Another Dem recently added...does anyone think this is fair? And yet, there is NO COLLUSION!"
Just a day before this, his lawyer, John Dowd, said it was time for the special counsel's investigation to end. Initially Mr Dowd said he was speaking for the president but later clarified he was "speaking for myself".
Also on Sunday, White House lawyer Ty Cobb said in a statement: "In response to media speculation... the White House yet again confirms that the President is not considering or discussing the firing of the Special Counsel".
Earlier the president berated former FBI deputy director Andrew McCabe, who was fired on Friday and former FBI director James Comey, whom Mr Trump sacked last year.
In a tweet, Mr Trump accused him of lying under oath before Congress, and described the contemporaneous notes that Mr McCabe and Mr Comey took following discussions with him as "fake memos".
Mr McCabe has given memos about conversations he had with President Trump to the Mueller inquiry, US media say. The memos could support claims that Mr Trump sought to obstruct justice.
Mr McCabe had already stepped down from his deputy post in January, but was sacked just two days short of his 50th birthday when he was expected to retire.
Attorney General Jeff Sessions said an internal investigation had concluded that Mr McCabe "made an unauthorised disclosure to the news media and lacked candour - including under oath - on multiple occasions".
Although the decision to fire Mr McCabe was made by Mr Sessions, Mr Trump had criticised him for months.
He has publicly pointed to donations that Mr McCabe's wife, a Democrat, received from a Clinton ally when she ran for the state Senate in 2015 as evidence that Mr McCabe was politically biased.
He welcomed the news of his dismissal as a "great day for democracy".
News that Mr McCabe had kept records of his conversations with Mr Trump at the time he was acting FBI director emerged on Saturday.
US media say the memos will support Mr Comey's account of the circumstances of his dismissal last May, reports BBC.
Mr Comey has testified that Mr Trump asked him for his "loyalty" and requested he drop an inquiry into his disgraced former National Security Adviser Michael Flynn.
He, too, has said he kept contemporaneous notes of his dealings with the president.
Responding to his firing, Mr McCabe said he was being punished because he had indicated that he would corroborate Mr Comey's version of events.