Former acting attorney general Sally Yates is expected to testify to Congress next week that she expressed alarm to the White House about President Donald Trump's national security adviser's contacts with the Russian ambassador, which could contradict how the administration has characterised her counsel.
Ms Yates is expected to recount her conversation on 26 January about Michael Flynn and to say she was concerned by discrepancies between the administration's public statements on his contacts with ambassador Sergey Kislyak and what really transpired, according to a person familiar with that discussion and knowledgeable about Ms Yates's plans for her testimony.
The person spoke on condition of anonymity so as not to pre-empt the testimony.
Ms Yates is expected to say that she told White House counsel Don McGahn that she believed Mr Flynn's communications with Mr Kislyak could leave Mr Flynn in a compromised position because of the contradictions between the public depictions of the calls and what intelligence officials knew to be true, the person said.
White House officials have said publicly that Ms Yates merely wanted to give them a "heads-up" about Mr Flynn's Russian contacts, but Ms Yates is likely to testify that she approached the White House with alarm, according to the person.
"So just to be clear, the acting attorney general informed the White House counsel that they wanted to give a 'heads up' to us on some comments that may have seemed in conflict with what he had sent the Vice President out in particular," White House press secretary Sean Spicer told reporters at a 14 February press briefing.
Mr Flynn resigned in February after published reports detailed Ms Yates's conversation with the White House. White House officials initially maintained that Mr Flynn had not discussed Russian sanctions with Mr Kislyak during the transition period, but after news reports said the opposite, they then admitted that he had misled them about the nature of that call.
"The issue, pure and simple, came down to a matter of trust," Mr Spicer told reporters.
Donald Trump's first 100 days: in cartoons
Donald Trump's first 100 days: in cartoons
Donald Trump's first 100 days in office were marred by a string of scandals, many of which caught the eye of the Independent's cartoonists
Trump's first 100 days have seen him aggressively ramp up tensions with his nuclear rivals in North Korea
Mr Trump has warned of a "major, major conflict" with the pariah nation lead by Kim Jong Un
Mr Trump dropped the "mother of all bombs" on alleged ISIS-linked militants in Afghanistan, amid an escalation of US military intervention around the globe
Mr Trump has been accused of falling short of the standards set by his predecessors in the Oval Office, including Franklin D Roosevelt
The tycoon's ascension to the White House came at a time when the balance of power is shifting away from Western nations like those in the G7 group
Western politicians, including the British Conservative party, have been accused of falling in line behind Mr Trump's proposals
Brexit is seen to have weakened Britain, reducing still further any political will to resist American leadership
Mr Trump's leadership has been marked by sudden and unexpected shifts in global policy
Trump's controversial missile strike on Syria, which killed several citizens, was seen by some analysts as an attempt to distract from his policy elsewhere
The President has also spent a large majority of his weekends golfing, rather than attending to matters of state
Though free of gaffes, a visit from Chinese president Xi Jinping spotlighted trade tensions between the two states
One major and unexpected setback came when Mr Trump's Healthcare Bill was struck down by members of his own party
Mr Trump has been a figure of fun in the media, with his approval at record lows
A string of revelations about Mr Trump's financial indiscretions did not mar his surge to the White House
Outgoing President Barack Obama was accused of wiretapping Trump Tower by his successor in America's highest office
The alleged involvement of Russian intelligence operatives in securing Mr Trump the presidency prompted harsh criticism
The explosive resignation of Security Adviser Michael Flynn, who lied about his links to the Russian ambassador, was just one scandal to hit the President
Many scandals, such as the accusation Barack Obama was implicated in phone-hacking, first broke on Mr Trump's Twitter feed
Donald Trump's election provoked mass protests in the UK, with millions signing a petition to ban him from the country
Donald Trump cited a non-existent terror attack in Sweden during a campaign rally
Donald Trump stands accused of stoking regional tensions in Eastern Asia
North Korea has launched a number of failed nuclear tests since Mr Trump took power
Theresa May formally rejected the petition calling for Mr Trump to be banned from the UK
When Mr Trump's initial so-called Muslim ban was struck down by a federal justice, the President mocked the 69-year-old as a "ridiculous", "so-called judge"
A week after his inauguration, Theresa May met with Mr Trump at the White House
Donald Trump's first days in office were marked by a hasty attempt to follow through on many of his campaign promises, including the so-called Muslim ban
Donald Trump's decision to ban citizens of many majority-Muslim countries from the US sparked mass protests
Revelations about Donald Trump's sexual improprieties were not enough to keep him from being elected President
British PM Theresa May was criticised by many in the press for cosying up to the new President
One of Mr Trump's top aides, Kelly Anne Conway, was mocked for describing mistruths as "alternative facts"
British PM Theresa May was quick to demonstrate that her political aims did not hugely differ from Mr Trump's
Donald Trump's inauguration, on 20 January 2017, sparked protests both at home and abroad
Mr Flynn was in frequent contact with Mr Kislyak on the day the Obama administration slapped sanctions on Russia for election-related hacking, as well as at other times during the transition period, a US official has said.
Ms Yates's scheduled appearance before a Senate Judiciary subcommittee, alongside former national intelligence director James Clapper, will provide her first public account of the conversation with the White House. It will also represent her first testimony before Congress since Ms Yates, an Obama administration holdover, was fired in January for refusing to defend Mr Trump's travel ban.
She was previously scheduled to appear in March before a House committee investigating Russian interference in the presidential election, but that hearing was cancelled.
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