The presumptive Democratic presidential candidate gave a "voluntary interview" to the FBI, according to a spokesperson. The State Department found "systemic weaknesses" in her electronic communications while in office.
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The US Federal Bureau of Investigation (FBI) on Saturday interviewed presumptive Democratic presidential nominee Hillary Clinton for more than three hours about her use of a private email server she used during her time as the US' top diplomat, according to a campaign spokesperson.
"Secretary Clinton gave a voluntary interview this morning about her email arrangements while she was secretary (of state)," said Clinton campaign spokesman Nick Merrill.
"She is pleased to have had the opportunity to assist the Department of Justice in bringing this review to a conclusion. Out of respect for the investigative process, she will not comment further on her interview," he added.
Clinton has apologized for using a private email account and server from 2009 to 2013, when she served as secretary of state under the Obama administration.
However, critics say she violated regulatory protocol on protecting classified documents, claiming it amounts to a prosecutable crime.
In May, the State Department said it found "systemic weaknesses related to electronic records and communications" during Clinton's time in office.
Thousands of emails sent to Clinton's private account were retroactively classified, while dozens were marked "top secret."
Saturday's inquiry follows an FBI investigation into whether Clinton's use of a private server constituted a crime for which she should be charged.
The interview comes weeks ahead of the Democratic National Convention, during which Clinton is expected to be formally nominated as the party's presidential candidate for the November election.
Hillary Clinton's running mate should square the circle. Required is the gravitas to be vice president. But he or she should also give her a boost in a key state or with a key constituency and appeal to progressives.
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Elizabeth Warren
The senator from Massachusetts is the darling of the progressive wing of the Democratic Party. The former Harvard law scholar is a passionate voice on economic justice and consumer rights issues. She has also shown herself to be an outspoken surrogate for Hillary Clinton willing to go-head-to-head with Donald Trump. By selecting Warren, Clinton would opt for an historic all-female ticket.
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Tim Kaine
The former governor and current senator of Virginia is considered the safe, if somewhat uninspired choice for a running mate. Kaine has several assets and one downside: He represents a swing state, speaks fluent Spanish and boasts extensive political experience. But like Clinton herself, Kaine would be a clear establishment choice in an election rife with anti-establishment fervor.
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Julian Castro
Seen by many as the future of the Democratic Party, Julian Castro would be the first Hispanic candidate on a presidential ticket of either of the two major parties. The youthful former mayor of San Antonio in Texas is currently Barack Obama's housing and urban development secretary. A graduate of both Stanford and Harvard, Castro has been a strong proponent for same-sex marriage.
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Sherrod Brown
A liberal Democrat from Ohio, Brown has been representing the swing-state in Washington since 1993. A vocal opponent of international trade agreements and strong supporter of his state's industrial base, he could help Clinton win over an important constituency: white workers. But choosing Brown would lead to a vacancy in the Senate which would likely be filled by a Republican.
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Cory Booker
A former mayor and current senator from New Jersey, Booker could help Clinton energize a key Democratic constituency: African-American voters. With his progressive leanings on social issues coupled with his more conservative stance on economic affairs, he offers something for both wings of his party. Unusual for a senator, Booker, with more than 1 million followers, is a Twitter celebrity.
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Xavier Becerra
The chairman of the Democratic Caucus in the US House of Representatives is the Democratic Party's highest ranking Latino and a strong advocate of immigration reform. Becerra, who hails from California and is fully bilingual, serves as an important link to the Hispanic community. He has been a strong Clinton supporter, but his progressive leanings could make him acceptable to Sanders' supporters.