Former White House aide Sebastian Gorka penned an op-ed for the Hill. Photo: Alex Wong / Getty Images

Former White House aide Sebastian Gorka slammed Michael Wolff's new book, "Fire and Fury," in an op-ed for the Hill, and he revealed that he "had been told to also speak to him for his book."

Why it matters: Gorka's comment seems to confirm Wolff's claims that he had access to White House staffers while reporting for the book, though Gorka did not make clear who told him to cooperate with the author.

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Voters cast ballots in Minnesota, Georgia, Connecticut, Wisconsin and Vermont

Photo: Spencer Platt/Getty Images

Primary elections are being held on Tuesday in Minnesota, Georgia, Connecticut, Vermont and Wisconsin.

The big picture: Georgia and Wisconsin both struggled to hold primaries during the coronavirus pandemic, but are doing so again — testing their voting systems ahead of the general election. Rep. Ilhan Omar (D-Minn.) is facing a strong challenger as she fights for her political career. In Georgia, a Republican primary runoff pits a QAnon supporter against a hardline conservative.

29 mins ago - Health

Trump administration buys 100 million doses of Moderna's vaccine

A volunteer in Moderna's vaccine clinical trial receives a shot. Photo: Paul Hennessy/NurPhoto via Getty Images

The U.S. government has agreed to buy 100 million doses of Moderna's experimental coronavirus vaccine for $1.5 billion, or $15 per dose.

Why it matters: The Trump administration, through Operation Warp Speed, has now bought initial batches of vaccines from Moderna, GlaxoSmithKline and Sanofi, Pfizer, Novavax, Johnson & Johnson and AstraZeneca before knowing whether they are safe and effective. The federal government also appears to own some of the patent rights associated with Moderna's vaccine.

Political world reacts to Biden tapping Kamala Harris as running mate

Sen. Kamala Harris and Joe Biden at a campaign event in March. Photo: JEFF KOWALSKY/AFP via Getty Images

Democrats from across the party — including some of the women on Joe Biden's vice-presidential shortlist — are championing his historic appointment of Sen. Kamala Harris as his running mate.

What they're saying: "Joe Biden nailed this decision," former President Barack Obama wrote in a lengthy statement. "By choosing Senator Kamala Harris as America’s next vice president, he’s underscored his own judgment and character. Reality shows us that these attributes are not optional in a president."