Outside view of Sunrise Tactical Supply store where school shooter Nikolas Cruz bought his AR-15. Photo: MICHELE EVE SANDBERG/AFP/Getty Images

The New York Times reports that Al Hoffman Jr., a top GOP donor, emailed six Republican leaders: "I will not write another check unless they all support a ban on assault weapons. Enough is enough!"

Why it matters: It's the first major pushback from an influential Republican urging lawmakers to support stricter gun control after the Parkland school shooting. And his money matters: He has given over $1 million to Right to Rise super PAC, which supported Jeb Bush’s 2016 campaign, and last spring he gave $25,000 to Mitch McConnell's Senate Leadership Fund.

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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.

25 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.

Updated 58 mins ago - Politics & Policy

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."