The Washington Post story cited five officials who said they had been briefed on interview requests from special counsel Robert Mueller to see if President Trump attempted to obstruct justice.
Mueller's plans emerged just a week after former FBI Director James Comey told the Senate Intelligence Committee that Trump pressed him in February to ease up on an investigation into Flynn.
Rosenstein, No. 2 at the Justice Department, appointed Robert Mueller as special counsel to investigate all angles of a probe into Russia-Trump, including the termination of Comey.
Jay Sekulow, a lawyer who is part of a team hired by Trump to deal with allegations of collusion by his campaign with Moscow, appeared to contradict Trump's statement on Twitter on Friday that he was being investigated for firing his Federal Bureau of Investigation director last month.
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.
Friday's tweets are the latest in a week of angry social media responses by the president after a report by The Washington Post that Mueller was looking into whether Trump obstructed justice. Comey said he believes Trump ultimately fired him "because of the Russian Federation investigation".
According to a Washington Post report Wednesday, Mueller was investigating the president for obstruction of justice and was interviewing Director of National Intelligence Dan Coats, National Security Agency Director Mike Rogers and Richard Ledgett, the recently retired deputy NSA director.
'Unprecedented Constitutional violations': Two attorneys general sue Trump
That puts the district in a "unique position" to file legal claims over the emoluments clause , Racine said. The lawsuit centers around Trump's decision to keep ownership of his company after becoming president .
On Thursday night, he issued a statement lashing out at news stories sourced to anonymous officials and that he believes are causing the President and Republicans to attack the Justice Department, the Federal Bureau of Investigation and Mueller for alleged leaks.
The President tweeted Friday that he was under "investigation," which he called a "witch hunt" in another tweet. "That's undemocratic on its face and a blatant violation of the president's oath of office".
CNN's Jake Tapper similarly pressed Sekulow on Sunday, noting the president's apparent confirmation of the investigation.
The president also tweeted about a poll that gives him a 50% approval rating, adding that it is higher than his predecessor Barack Obama's. Over the weekend, a Trump lawyer publicly refused to rule out that possibility, stressing that the president has the necessary authority. Trump wrote on Twitter, in a pair of messages that ended with a reference to his campaign slogan "Make America Great Again". Trump, who expressed displeasure with Session's withdrawal from the case, wouldn't hesitate to apply pressure.
Apart from Rosenstein and Sessions, the only confirmed Justice official is Rachel Brand, the associate attorney general, whom the Senate approved on a party-line vote. And with the investigation reaching all the way up to Trump - and with Trump regularly tweeting about it - it's almost impossible for the White House to compartmentalize.
Trump seemed to confirm that story - his White House hadn't denied it but instead condemned the leak from which it sprang - in a Friday morning tweet.
Starr's op-ed follows comments he made on CNN's "New Day" Thursday morning in which he said there is now no obstruction of justice case against Trump, based on the evidence that has been made public so far.
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