"Secretary Clinton gave a voluntary interview this morning about her email arrangements while she was secretary," Clinton spokesman Nick Merrill said in a statement. "She is pleased to have had the opportunity to assist the Department of Justice in bringing this review to a conclusion."
Clinton told MSNBC's Chuck Todd Saturday evening that the interview was something "I had been eager to do."
An aide said the interview occurred at FBI headquarters in Washington Saturday morning. The FBI declined to comment.
The meeting signals the investigation is coming to an end, and sources tell CNN the expectation is Clinton will not face charges.
Still, the probe has cast a shadow over Clinton's campaign, and news of FBI agents interviewing the former secretary of state gave Republicans an opportunity to pounce after Clinton has spent weeks at the top of most polls. It has also put the Justice Department in the position of having a major impact on the 2016 race -- a role made even more awkward this week by an unplanned meeting between former President Bill Clinton and Attorney General Loretta Lynch that raised questions about the impartiality of the probe.
The question now becomes how long it will take for the FBI to conclude its probe.
Within the next two weeks or so, the expectation is there will be an announcement of no charges being brought against Clinton so long as no evidence of wrongdoing emerges from her interview with the FBI, sources familiar with the investigation told CNN. CNN has previously reported
no charges were expected to be brought against Clinton because the investigators had not found evidence to warrant charges, according to multiple law enforcement officials. A Democrat close to Clinton said Saturday the campaign believes the FBI will announce its decision before the conventions.
Sources familiar with the investigation had previously told CNN the Justice Department's aim was to wrap up before the Republican and Democratic conventions later this month. The timing is crucial, because if Clinton were to be indicted before the convention, Democrats could perhaps nominate another candidate.
Asked about reports that she is unlikely to face charges, Clinton told Todd, "I am not going to comment on the process. I have no knowledge of any timelines. This is entirely up to the department."
Presumptive Republican nominee Donald Trump said it was "impossible for the FBI not to recommend criminal charges against Hillary Clinton."
"It is impossible for the FBI not to recommend criminal charges against Hillary Clinton. What she did was wrong! What Bill did was stupid!" Trump tweeted, referring to the former president's meeting
After reports surfaced that Clinton was unlikely to be charged, Trump then tweeted, "It was just announced-by sources-that no charges will be brought against Crooked Hillary Clinton. Like I said, the system is totally rigged!"
Asked by CNN's Brianna Keilar in a "State of the Union" interview Saturday about the possibility of the presumptive Democratic nominee being indicted, New Jersey senator -- and potential Clinton running mate -- Cory Booker flatly ruled out the possibility.
"That's just not going to happen," said Booker, who declined to answer whether the former secretary of state should step aside in favor of Vermont Sen. Bernie Sanders or Vice President Joe Biden if she's indicted before the election.
"That's something that, to me, is not even within the realm of possibility," Booker said.
A reminder of Clinton's trustworthiness issues
The interview comes at the end of a week that could have been another win for Clinton as Trump continues to struggle, but instead demonstrated her -- and her husband's -- inability to avoid unforced errors and leave past controversies behind.
House Benghazi Committee Republicans on Tuesday released their report on the September 11, 2012, attack where four Americans died, which drew significant media attention but lacked significant new information that changed the dynamic of the race. The panel's biggest discovery was finding the email address and server over a year ago.
Clinton has maintained that no emails marked as classified at the time were sent on the server, and that information in some emails was retroactively classified. And her campaign has actively portrayed the congressional investigation into Benghazi as a partisan exercise, highlighted by last October's 11-hour hearing where Clinton testified.
But the FBI interview, along with news of the Clinton-Lynch meeting, shows Clinton can't move past the email issue -- a story that overshadowed the launch of her campaign in early 2015 and helped Bernie Sanders find running room.
Sanders, in fact, is still in the race, pushing for progressive changes to the Democratic platform. As recently as Thursday, the Vermont senator said he's not ready
to endorse Clinton.
For Republicans, the possibility of an indictment is a satisfying one. The GOP has pursued the Clintons for 25 years, from the scandals of Bill Clinton's presidency and his impeachment to Hillary Clinton's actions leading up to and during the Benghazi attacks. That the FBI could hamstring her presidential ambitions is a bonus for the GOP.
Republican National Committee Chairman Reince Priebus said in a statement that Clinton is now "the first major party presidential candidate to be interviewed by the FBI as part of a criminal investigation surrounding her reckless conduct."
"That the FBI wanted her for questioning reinforces her central role in deliberately creating a culture which put her own political ambitions above State Department rules and jeopardized our national security. In over 2,000 emails, Clinton's decision exposed classified information, including 22 that included top secret intelligence, just so she could skirt transparency laws in order to hide her shady dealings as secretary of state," Priebus continued.
He added, "The American people need to have confidence that the Obama Justice Department is conducting a fair and impartial investigation, but when the attorney general meets secretly with Bill Clinton just days before Hillary's interrogation is conducted discreetly over a holiday weekend, it raises serious concerns about special treatment."
RNC chief strategist and communications director Sean Spicer also pounced on the news Saturday afternoon.
".@HillaryClinton campaign statement says She "voluntarily" met w @FBI for 3.5 hours this morning - yeah, lots of people volunteer 2 do that," he tweeted.
He quickly added, "Now I get it! After Attorney General @LorettaLynch & @billclinton secretly meet @HillaryClinton spends 3.5 hrs #FourthOfJulyWeekend @fbi HQ"
But the interview is a reminder for Republicans that Trump is a major liability himself. He's more unpopular than Clinton is and his poll numbers are sliding. Her campaign and allies have been airing millions of dollars' worth of ads against him, many highlighting his impolitic statements about women and minorities -- two groups that are backing Clinton by large margins.
The GOP establishment has yet to fully rally around the billionaire New York businessman, who trails Clinton 46% to 40% in the latest CNN Poll of Polls and has struggled to raise money in comparison to the Clinton and Democratic juggernaut.
The revelations of the email server as part of the House's Benghazi probe have also resulted in lawsuits filed in Freedom of Information Act cases by the conservative Judicial Watch and other groups.
One such lawsuit saw Clinton's top aide, Huma Abedin, deposed this week, along with other State Department staffers.
A State Department Inspector General report released in late May said Clinton failed to follow rules or inform key staff about the server.
"At a minimum, Secretary Clinton should have surrendered all emails dealing with Department business before leaving government service and, because she did not do so, she did not comply with the Department's policies that were implemented in accordance with the Federal Records Act," the report said