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It's been revealed that US Attorney-General Jeff Sessions had two conversations with the Russian ambassador to America during the election campaign last year.
That's not what he said during his confirmation hearing when asked if he was aware of any contact between the Trump campaign and Russian officials.
A spokesperson for Mr Sessions says there was nothing misleading about his answer to Congress — because his conversations had taken place in his capacity as a member of the Senate Armed Services Committee, not a Trump representative.
But that hasn't stopped senior Democrats from calling for his resignation.
These are some of the people who could determine what happens from here.
Jeff Sessions
Job: Attorney-General
It might seem strange to start this list with Mr Sessions himself, but as Attorney-General, he oversees the Justice Department and the FBI — the two agencies which have been carrying out the investigation of Russian influences on the 2016 election.
There had already been calls for him to recuse himself (that is, stand aside from overseeing these investigations) but so far he's declined to do this.
It's also the role of the Attorney-General to appoint "special prosecutors", lawyers from outside Government who investigate misconduct in office.
You may recall that during of the election debates, Donald Trump had promised to ask his future Attorney-General to appoint a special prosecutor to investigate his rival Hillary Clinton. Now, there are calls for a special prosecutor to investigate the communications his campaign had with Russia.
Richard Burr and Devin Nunes
Jobs: Senate Intelligence Chairman and House Intelligence Chairman
These are the Republicans who are overseeing the congressional investigations into Russian influence on the presidential election.
Last month, the Washington Post reported that they'd both, at the behest of the White House, contacted news organisations and disputed articles which made allegations about the Trump campaign's contacts with Russian officials.
"I felt I had something to share that didn't breach my responsibilities to the committee in an ongoing investigation," Mr Burr told the newspaper.
Nancy Pelosi and Chuck Schumer
Jobs: House Minority Leader and Senate Minority Leader
Ms Pelosi is the most senior Democrat in the House of Representatives and is piling pressure on the Trump administration, saying Mr Sessions must resign because he "lied under oath" during his confirmation hearing.
"Attorney-General Sessions has never had the credibility to oversee the FBI investigation of senior Trump officials' ties to the Russians," she said.
"That is why Democrats have consistently called for Sessions to recuse himself from any oversight of the investigation."
Representative Elijah Cummings, the most senior Democrat on the House Oversight Committee, has also called for Mr Sessions' resignation, as has senator Elizabeth Warren.
Meanwhile, Mr Schumer called the resignation of Michael Flynn as national security adviser in similar circumstances the "beginning of a much longer story".
He wants the Trump administration to preserve all records from its transition period, saying: "There is real concern that some in the administration may try to cover up its ties to Russia by deleting emails, texts and other records."
Darrell Issa and Lindsey Graham
Jobs: House and Senate Republicans
Last week, Mr Issa broke ranks with other Republicans by arguing that Mr Sessions should recuse himself and appoint a special prosecutor to investigate ties between the Trump campaign and Russia.
"You cannot have somebody, a friend of mine, Jeff Sessions, who was on the campaign and who was an appointee," he told HBO's Bill Maher.
"You're going to need to use the special prosecutor's statute and office."
Meanwhile, Senator Graham has argued that if the FBI determines the Trump campaign illegally coordinated with Russia, Mr Sessions should remove himself from any decisions on whether prosecutions should be pursued.
"When it comes to Russia, he [Mr Trump] has a blind spot. The bottom line is that Putin is disrupting democracy everywhere," Senator Graham told CNN.
John McCain
Job: Senate Republican
The former presidential candidate has been one of the most outspoken Republicans on the issue of Russia.
"What the Russians tried to do to our election could have destroyed democracy," he told CNN.
He's called for a select committee to investigate the issue.
Last year, Mr McCain supported the nomination of Mr Sessions for Attorney-General, saying: "I believe Jeff has the right knowledge and experience to effectively lead the Justice Department."
James Comey
Job: Director of the FBI
You'll probably remember it was Mr Comey who oversaw the FBI's investigation of Hillary Clinton over her use of a private email server as secretary of state.
Now, the FBI is investigating alleged contacts between the Russian Government and people associated with Mr Trump, as well as the hacking of the Democratic National Committee during the election campaign.
Donald Trump
Job: President
We've left the most obvious name till last. As was the case when national security adviser Michael Flynn was similarly under fire, the President has a bigger say than anyone on what happens now.
Topics: world-politics, donald-trump, united-states