Donald Trump being probed for possible obstruction of justice

President Donald Trump appeared to confirm reports that Special Counsel Robert Mueller is investigating him for possible obstruction of justice, tweeting Thursday that "now they go for obstruction of justice on the phony story".

The NSA said in statement that it will "fully cooperate with the special counsel", and declined to comment further.

The Post reports that investigators have also been looking into some of Trump's associates for any evidence of possible financial crimes.

Conservative talk show host Sean Hannity responding to a bombshell report claiming President Trump is under investigation for obstruction of justice on Wednesday, and called on Special Counsel Robert Mueller and Deputy Attorney General Rod Rosenstein to resign Wednesday.

Trump was forced to fire Flynn in February after he misled the White House about his contacts with Russian officials past year as a member of Trump's transition team.

The president vehemently denies any collusion between himself or any of his associates and Russian Federation.

The move to investigate the US President comes after Mr Trump fired Federal Bureau of Investigation director James Comey on May 9, according to the The Post. Investigators are also considering the conversations Comey and the president had leading up to that point.

A few days later, Mr Trump individually asked Mr Coats and Mr Rogers to issue public statements to the effect that there was no evidence of co-ordination between his campaign and Russian Federation.

"While the president has the right to, he has no intention to do so", Sarah Sanders, a White House spokesman said.

Coats and Rogers refused to answer questions about the matter during a Senate committee hearing last week.

The interviews could come as early as this week, the Post said.

A spokesman for Trump's attorney Marc Kasowitz fiercely denied the allegations.

Mueller briefed senators on his work on Wednesday.

The committee leaders said in a statement that they "look forward to future engagements" with Mr Mueller.

On Wednesday Mr Mueller met the leaders of the Senate Intelligence Committee in an effort to ensure their investigations did not conflict.

Significantly, Preet Bharara, the India-born former top U.S. federal prosecutor, earlier this week had said that there was enough evidence to begin an obstruction of justice case against Trump over his alleged interference in the Russian Federation probe.

However, any findings of criminal activity would put pressure on the Republican-controlled Congress to use them as the basis for launching impeachment proceedings against Trump.