Corker speaks at a Trump rally in Nashville in March. Photo: Mark Humphrey / AP

President Trump took aim at Republican Sen. Bob Corker Sunday morning via Twitter, saying he lacked the "guts" to seek re-election after begging for an endorsement. This came a few days after Corker said he wouldn't support Trump's tax plan if it increased the deficit and said Secretaries Mattis and Tillerson, along with John Kelly, are helping to keep the U.S. from "chaos."

Corker then fired back: "It's a shame the White House has become an adult day care center. Someone obviously missed their shift this morning."

Corker was indeed in the running for secretary of state, and introduced Trump at a rally in March, speaking glowingly of him at that time. But he's been increasingly frustrated with Trump, particularly over a number of foreign policy moves and statements.

Why it matters: Corker is retiring — but not until January 2019. Until that time he's free to vote however he sees fit, and challenge Trump whenever he feels it necessary.

Go Deeper: A Corker ally on his thinking.

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The hard seltzer wars are heating up

Illustration: Aïda Amer/Axios

Competition in the hard seltzer market is heating up in the closing weeks of summer, as big companies like Constellation Brands, AB InBev and Molson Coors have entered the market and Coca-Cola is poised to join the fray in 2021.

Why it matters: The coronavirus pandemic has increased alcohol sales overall and hard seltzers are exploding in popularity and look to have staying power, boasting record high sales in recent weeks.

Why you should be skeptical of Russia's coronavirus vaccine claims

Photo: Alexey Druzhini/Sputnik/AFP via Getty Images

Russian President Vladimir Putin announced Tuesday that his country has registered a coronavirus vaccine and said that one of his daughters has already been inoculated, AP reports.

Why it matters: Scientists around the world are skeptical about Russia's claims. There is no published scientific data to back up Putin's claims that Russia has a viable vaccine — or that it produces any sort of immunity without significant side effects.

A quandary for state unemployment agencies

Illustration: Aïda Amer/Axios

State agencies charged with paying unemployment benefits to jobless residents have their backs against the wall as they rush to parse President Trump's executive actions on coronavirus aid.

Why it matters: States are being asked to pitch in $100 per unemployed resident, but it’s a heavy lift for cash-strapped states that are still unclear about the details and may not opt-in at all. It leaves the states and jobless residents in a state of limbo.