Trump has repeatedly denied that his campaign colluded with Russian Federation.
After a pair of tweets again attacking the probe by Special Counsel Robert Mueller, Trump wrote: "This is a awful situation and Attorney General Jeff Sessions should stop this Rigged Witch Hunt right now, before it continues to stain our country any further".
Manafort's trial is the first arising from Mueller's investigation into potential ties between Donald Trump's presidential campaign and Russian Federation.
The White House brought out five top intelligence and national security officials to answer questions on Thursday, demonstrating a united front on fighting Russian election meddling even as the President continues to cast doubt on the issue. Among them: that Mueller not ask any questions about actions Trump has taken as president, including his private discussions with Comey.
In any case, Sessions recused himself from the investigation in March 2017 and does not have the power to stop it.
"It's not an order".
The President has said many times he would be willing to speak with Mueller but would await his legal teams guidance. The president's tweet was merely reiterating that his camp wants the investigation over "sooner rather than later", Sanders said.
The national security adviser, a longtime Russian Federation hawk, also defended the president's much-maligned press conference after his tête-à-tête with Vladimir Putin in Helsinki, when Trump did not address Russia's interference in the 2016 presidential election.
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McConnell and House Speaker Paul Ryan have defended Mueller's investigation in the face of Trump's attacks but said they don't believe Trump would fire the special counsel.
But Sherman reports that Trump was serious about the apparent command and that he's considering firing Deputy Attorney General Rod Rosenstein, who oversees the Mueller probe due to Sessions' recusal.
Trump "makes my job harder with some of his tweets".
"They ought to let them conclude their work", Thune said.
Whether Sessions has the ability to end Mueller's probe appears to be highly doubtful.
Regardless, that and other Trump tweets regarding the investigation are likely of interest to the special counsel, who has been scrutinizing the president's online attacks on the probe as part of his inquiry into obstruction of justice.
Trump tweeted that Sessions "should stop this Rigged Witch Hunt right now". Moscow has denied such interference, and Trump has denied any collusion by his campaign or any obstruction of justice. "He worked for me a very short time".
"Our democracy is in the crosshairs", Ms Nielsen said, adding that the cyberthreat now exceeded the danger of a physical attack against the USA by a hostile foreign group.
The tweet renewed Democratic complaints that Trump is wrongly challenging the independence of the special counsel. And it revived the idea that the president's tweets themselves might be used as evidence that he is attempting to obstruct justice.