Former FBI Director James Comey James Brien ComeyDemocrats fear Russia interference could spoil bid to retake Senate Book: FBI sex crimes investigator helped trigger October 2016 public probe of Clinton emails Trump jabs at FBI director over testimony on Russia, antifa MORE and his wife donated to the presidential campaign of Sen. Amy Klobuchar Amy KlobucharSocial media platforms put muscle into National Voter Registration Day Battle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates MORE (D-Minn.), according to recently released Federal Election Commission filings.

Comey donated $2,700 to Klobuchar's campaign, and his wife made two separate contributions — $1,000 and $1,700 — during the first quarter of 2019. Individuals can contribute a maximum of $2,800 during the primaries.

Their donations were first reported by Rolling Stone.

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Other high-profile donors to Klobuchar's campaign include Minnesota Vikings owner Zygi Wilf, Twenty-First Century Fox CEO Dana Walden and Zynga founder Mark Pincus.

Klobuchar and Comey were in the same law school class at the University of Chicago. Comey once told Vogue that Klobuchar was "annoyingly smart."

Klobuchar is one of 20 presidential candidates vying for the 2020 Democratic nomination. That number is expected to grow to 21 on Thursday, when former Vice President Joe Biden Joe BidenBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Democratic groups using Bloomberg money to launch M in Spanish language ads in Florida Harris faces pivotal moment with Supreme Court battle MORE enters the race.