The special counsel is examining Trump's possible obstruction of justice

In a tweet on Thursday morning, Trump accused Special Counsel Robert Mueller of conducting a "witch hunt" after news reports suggested that the president may be under investigation for obstruction of justice.

President Trump warned the White House could face countless investigations and Watergate-sized scandals during his 2016 campaign for the country's top office.

Mueller's friendship with Comey and Mueller's selection of several investigators who have made campaign donations to Democrats are among the issues Gingrich is raising as problematic.

Questions have swirled around potential obstruction of justice since Mr Comey's dramatic testimony last week.

Over the course of his 2016 presidential campaign, the Republican repeatedly blasted his Democratic rival, Hillary Clinton, for the investigation into her use of a private email server while she was Secretary of State under President Obama.

Those who have agreed to be interviewed, according to the Post, include Dan Coats, director of national intelligence; Mike Rogers, chief of the National Security Agency; and Richard Ledgett, who recently left his post as deputy to Rogers.

Mr Mueller was named as a special counsel by Deputy Attorney General Rod Rosenstein, eight days after Mr Comey's dismissal to lead the Russian Federation investigation.

Legal analysts called Mr Mueller's move a logical one, but said obstruction of justice is hard to prove unless the intent is clear and specific. "They're the ones we are not winning in", he said at the Mid-Winter Ball.

Mr Putin also echoed Mr Trump's criticism of Mr Comey, saying it was "very strange" for a former Federal Bureau of Investigation chief to leak details of his conversations with the USA president to the media through a friend of his. He also told the Senate Intelligence Committee in 8 June testimony that he believed Trump had directed him to drop a related agency investigation into the president's former national security adviser, Michael Flynn.

After Comey's firing, the administration gave differing reasons for his dismissal.

The expansion of special counsel Robert Mueller's investigation would represent the clearest legal threat to date for Trump, who has long maintained that he is not personally under investigation - and who reportedly pressured former FBI Director James Comey to say so publicly. Mr Trump later contradicted his own staff, saying on 11 May he had the Russian Federation issue in mind when he fired Mr Comey. According to the Washington Post report, the investigation into Trump kicked off days after Comey was sacked on May 9.

A spokesman for Trump's personal lawyer in the Russian Federation matter Marc Kasowitz said, "The FBI leak of information regarding the President is outrageous, inexcusable and illegal".

Mueller spokesman Peter Carr told NPR's Carrie Johnson, "We'll decline to comment". Gingrich told The Associated Press in an interview this week that his feelings about him began to change after Comey testified to a Senate panel that he had leaked his personal memos in order to trigger the appointment of a special counsel.

"The vice president is focused entirely on his duties and promoting the president's agenda and looks forward to a swift conclusion of this matter".

  • Leroy Wright