Trump mocked federal investigators in his tweet

It is believed that allegations of Trump's obstruction of justice relate to his attempts to encourage Comey to drop an investigation into Mike Flynn, who was forced to resign as Trump's national security adviser earlier this year.

The investigation into obstruction of justice reportedly began soon after Trump fired former FBI Director James Comey, who was investigating the possible Trump-Russia ties, on May 9.

Mr Comey, who had been leading one of several Russian Federation inquiries, testified to Congress last week that Mr Trump had pressured him to drop the inquiry into former National Security Adviser Michael Flynn.

In response to the report, Mark Corallo, a spokesman for Trump's personal attorney Marc Kasowitz, said: "The FBI leak of information regarding the president is outrageous, inexcusable and illegal".

News that Mueller is now investigating Trump for obstruction of justice comes amid reports that Trump has discussed whether to remove the special counsel. Significantly, Preet Bharara, the India-born former top United States 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.

Before the sacking, Mr Trump had sought and received assurances from Mr Comey that he personally was not under investigation.

After Mr Comey's testimony, Mr Trump said he had been vindicated because it was confirmed he had been told on three occasions that he was not under investigation.

Coats will also meet with members of the Senate intelligence committee Thursday, one week after his tense grilling by the panel, according to a committee source.

The stated focus has been Russia's alleged efforts to tilt last November's presidential election Trump's way, and whether the winner's campaign was involved in any way.

Deputy attorney general Rod Rosenstein, who appointed Mr Mueller last month, testified on Tuesday that he had seen no evidence of good cause to sack him. Legal action against a president would take the form of impeachment, Stanford law professor David Sklansky has said.

A news story from the Washington Post reports that the special council investigating any possible collusion between the Trump campaign and Russian Federation has taken a new turn.

Mueller's office declined to comment.

Trump's legal team quickly denounced the report on Wednesday. It is not known whether or not Comey's successor had informed Trump of the change in the probe.

  • Leroy Wright