Aides rushed to limit the damage, insisting he was not issuing an order as Session's boss.
In response to Wednesday's White House briefing, Democratic senators, led by Minority Leader Chuck Schumer, D-N.Y., said, "We implore the administration to take this very real and imminent threat to our elections and our democracy more seriously".
Bolton's letter comes weeks after Trump publicly undermined the conclusions of American intelligence agencies regarding Russian interference. One of the good things about using that, he's established a clear sort of practice now that he expresses his opinions on Twitter.
In a series of tweets, the US President asserted that neither he nor his campaign had any collusion with the Russians, and allegations in this regard was a total hoax.
"It would be far better if the President refrained from commenting and for Mr. Mueller to continue his investigation, which so far already has 30 indictments, including Russian nationalists", she said on Capitol Hill.
The relationship between Sessions and the president has been strained for more than a year, since the attorney general recused himself from investigations relating to the election because of Sessions' own role on the Trump campaign.
In June, Trump's 2020 campaign manager, Brad Parscale, called for Sessions to be fired and "end the Mueller investigation".
"The president's not obstructing, he's fighting back", said Sanders, dismissing the idea Trump's tweets could be tantamount to obstruction of justice. "America must never accept it", he wrote.
Donald Trump threatens government shutdown if he doesn't get wall funding
He said that needed border security reforms included the wall, the visa lottery, catch-and-release policies, and immigration laws. Trump has requested $25 billion to build the border wall and $1.6 billion has already appropriated for the project.
In view of the tweet, "I think it would be helpful to have the debate on that bill", Collins said. "But if anyone helped Russian Federation to hack/steal they deserve justice", said Republican operative Ari Fleischer.
Giuliani has repeatedly warned that such an interview would expose Trump to legal danger, saying that if he made any misstep or if Mueller later determined that other witnesses were more credible than Trump about what he had said and done, the President could face accusations of perjury.
The president's social media outburst renewed discussion of the significance of his tweets.
On Tuesday, according to the Times, Mueller sent Trump's team a revised interview request in which the topics remained the same, but they agreed to allow the president to respond to certain questions in writing - if they could follow up on those answers in person if necessary.
Mr Manafort's charges stem from his consulting work in the Ukraine, in which he allegedly received millions of dollars that he failed to report to the USA government.
"Paul Manafort worked for Ronald Reagan, Bob Dole and many other highly prominent and respected political leaders", Trump tweeted.
He's a Russian pop star who was involved in setting up that infamous 2016 meeting at Trump Tower between some of Donald's associates and some Russian operatives who promised to give the Trump campaign some dirt on Hillary Clinton.
The tweets come at a particularly sensitive time in the investigation, as a federal jury in Virginia is hearing evidence in Manafort's trial on tax evasion and fraud charges.
Trump has voiced skepticism about Russia's role in US election meddling, drawing accusations from Democrats and Republicans alike that he is ignoring a threat to American democracy.