Special counsel Robert Mueller's team raised the prospect of issuing a grand jury subpoena to compel President Donald Trump to testify as part of the Russia probe, the president's former lawyer has said.
Lawyer John Dowd told The Associated Press that Mr Mueller's team broached the subject in March during a meeting with Mr Trump's legal team while they were negotiating the terms of a possible interview with the US President.
The meeting marked the first time the special counsel's office raised the possibility of compelling President Trump to testify as part of the ongoing investigation.
Mr Mueller is probing not only Russian election interference and possible coordination with Trump associates, but possible obstruction of justice by Mr Trump.
Mr Dowd's comments, which come more than a month after he resigned from the legal team, provide a new window into the nature of the Trump legal team's interactions with the special counsel, who the president has increasingly tried to undermine through public attacks.
Yesterday, Mr Trump said it was "disgraceful" that a list of proposed questions drafted in response to Mr Mueller's negotiations with the legal team was "leaked" to the news media.
The New York Times late on Monday published around four dozen questions compiled by Mr Trump's lawyers during negotiations with Mr Mueller's investigators earlier this year over the prospect of a presidential interview.
Mr Mueller is investigating Russian meddling in the 2016 election, whether Mr Trump's campaign was involved and if the president obstructed justice after the campaign.
The Times report said Mr Trump's lawyers compiled the questions into a list and that document was "provided to The Times by a person outside Mr Trump's legal team".
The questions range from Mr Trump's motivations for firing FBI director James Comey a year ago to contacts Mr Trump's campaign had with Russians.
Although Mr Mueller's team has indicated to Mr Trump's lawyers that he is not considered a target, investigators remain interested in whether the president's actions constitute obstruction of justice and want to interview him about several episodes in office. They have not yet made a decision about an interview.
Mr Trump lawyer's Jay Sekulow declined to comment to the AP, as did White House lawyer Ty Cobb.
In his tweet, Mr Trump said there were "no questions on Collusion" and, as he as many times before, called Mr Mueller's investigation a "Russian witch hunt". He said collusion with the Russians "never existed".
In a second tweet, Mr Trump said: "It would seem very hard to obstruct justice for a crime that never happened."
The questions do appear to indicate that Mr Mueller is looking into possible collusion.
Some touch on Russian meddling and whether the Trump campaign coordinated in any way with the Kremlin.
In one question obtained by the Times, Mr Mueller asks what Mr Trump knew about campaign staff, including his former campaign chairman Paul Manafort, reaching out to Moscow.
Mr Mueller has brought several charges against Mr Manafort already, including money laundering and bank fraud.
None of the charges relate to allegations of Russian election interference and possible coordination with Trump associates, and Mr Manafort has denied having anything to do with such an effort.
One question asks what discussions Mr Trump may have had regarding "any meeting with Mr Putin", referring to Russian president Vladimir Putin. Another question asks what the president may have known about a possible attempt by his son-in-law, Jared Kushner, to set up a back channel with Russia before Mr Trump's inauguration.
Many of the questions obtained by the Times centre on the obstruction issue, including his reaction to Attorney General Jeff Sessions' recusal from the Russia investigation, a decision Mr Trump has angrily criticised.
The queries also touch on Mr Trump's businesses and his discussions with his personal lawyer, Michael Cohen, about a possible Moscow real estate deal.
Mr Cohen's business dealings are part of a separate FBI investigation.
Additional questions center on Michael Flynn, Mr Trump's former national security adviser, who has pleaded guilty to lying to the FBI about his discussions on sanctions against Russia with Russian ambassador Sergey Kislyak during the presidential transition.
Mr Flynn is now cooperating with Mr Mueller's investigators.
"What did you know about phone calls that Mr Flynn made with the Russian ambassador, Sergey I Kislyak, in late December 2016?" reads one question. Another asks if there were any efforts to reach out to Flynn "about seeking immunity or possible pardon".
Mr Flynn was fired on February 13, 2018 after White House officials said he had misled them about his Russian contacts during the transition period by saying that he had not discussed sanctions.
The following day, according to memos written by Mr Comey, Mr Trump cleared the Oval Office of other officials and encouraged Mr Comey to drop the investigation into Flynn.