Mueller, a Republican and former Federal Bureau of Investigation director who served a Republican and Democratic president, has broad support in Congress, where Republicans control both chambers.
In a further tweet, Trump suggested Manafort has been harshly mistreated.
The most inflammatory of Trump's tweetssaid, "This is a bad situation and Attorney General Jeff Sessions should stop this Rigged Witch Hunt right now, before it continues to stain our country any further". One tweet is reigniting the question of whether the president's actions are obstructing justice. "Bob Mueller is totally conflicted, and his 17 Angry Democrats that are doing his dirty work are a disgrace to United States of America!" the President tweeted.
On Monday, the special counsel sent Trump's legal team a new proposal about the terms of a possible presidential interview, renewing negotiations about a sit-down after an extended standoff.
While Bolton said Trump raised the issue during an expanded bilateral meeting with Putin, Coats clearly stated that he is "not in a position to either understand fully or talk about what happened in Helsinki".
Trump's tweet to Sessions immediately provoked conversation about whether he had shown an intent to obstruct justice in plain sight, following a long succession of previous tweets pressuring Sessions that appear to undermine arguments that Trump was acting with no malice in firing former FBI Director James Comey at the time he was in charge of the Russian Federation investigation. Earlier this summer, Parscale tweeted that Trump should fire Sessions in order to bring the Mueller probe to an end.
They, along with National Security Agency Director Paul Nakasone and FBI Director Christopher Wray, appeared together at the White House on Thursday to try to reassure the American people they are doing everything in their power to address the threat.
"Just because @realDonaldTrump obstructs justice in full public view by calling on Sessions to interfere in Mueller investigation doesn't mean it's not obstruction of justice". "He worked for me for a very short time".
"The President can voice his opinion, I don't deny him that ability, in this case I wish he wouldn't I just don't think it helps him", Republican Rep. Chris Stewart of Utah told CNN's Wolf Blitzer.
Manafort served as Trump's campaign chief from May to August 2016 and the president asked Wednesday: "why didn't government tell me that he was under investigation". "These old charges have nothing to do with Collusion - a Hoax!"
The former NY mayor pointed out that Trump said Sessions "should" stop the probe not that he "must" stop the probe.
The president's social media outburst renewed discussion of the significance of his tweets. Chiming in with Sanders, Trump lawyer Rudy Giuliani, also former mayor of NY, said: "I think it's very well established the president uses tweets to express his opinions". Giuliani said. "We have every reason to believe they don't have anything".
"It's not an order, it's the President's opinion", White House Secretary Sarah Huckabee Sanders said. Although experts believe obstruction by tweet is possible, prosecutors have to prove beyond a reasonable doubt that a particular act got in the way of an investigation and that the person who did it meant to obstruct.
Mueller already is interested in some of Trump's tweets to the extent they raise obstruction of justice concerns.
Trump has heard from top allies that he should be more outspoken about Sessions, even as Trump remains wary of firing him, people familiar with the conversations say.
But Nielsen said USA agencies have "seen a willingness and a capability on the part of the Russians" to attack US election infrastructure. It could be a much different story under a new Democratic House if the midterms go against the GOP.
Giuliani added the president may be within his legal rights to obstruct justice if he wishes.