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Former Vice President Joe Biden, in an interview with "Axios on HBO," promised to prohibit his son Hunter, and other family members, from cashing in on his name and position overseas if he wins the presidency. 

Why it matters: Questions may intensify as impeachment proceedings against President Donald Trump move to the Senate and the Iowa caucuses approach. Biden already has drawn scrutiny for allowing his son to get paid handsomely by a Ukrainian business while the VP led the Obama administration's anti-corruption push in Ukraine.

The big question: Will Biden move away from a posture of defending his son's honor to acknowledge and address legitimate concerns about his own judgment among some Democrats and swing voters?

  • Biden told Axios' Mike Allen that Hunter did nothing wrong — but that he has not dug into what Hunter actually did while working in Ukraine.
  • “I don't know what he was doing. I know he was on the board. I found out he was on the board after he was on the board and that was it,” Biden told us. 
  • Asked whether he wants to get to the bottom of it, Biden said, "No. Because I trust my son."

Biden said his family will be banned from making money overseas if he wins, faulting the president's family members' government and business conflicts of interests — not Hunter’s work — for the need for a formal guardrail. 

  • “They will not be engaged in any foreign business because of what's happened in this administration.”

Axios' Alexi McCammond, who spent time on Biden's Iowa bus tour this week, said after he called a man a "damn liar" at one event for making unsubstantiated claims about Hunter's work, Biden told reporters the next day that he "probably shouldn't have challenged him to pushups" and doesn't want to stoop to Trump's level in terms of engagement with critics.

Go deeper:

Go deeper

Robinhood IPO brings meme stock icon into the Wall Street fold

Illustration: Sarah Grillo/Axios

Today is the day everyone can begin buying and selling shares in Robinhood, which goes public on the New York Stock Exchange after raising $1.89 billion in its IPO.

Why it matters: Robinhood is considered a proxy for the rise of retail investing, particularly among younger Americans. But it also has drawn regulatory and political scrutiny for a variety of business practices, and found itself in the crosshairs after users drove up the price of GameStop stock earlier this year.

Study: Cost of carbon emissions measured in lives lost is high

Data: Our World in Data; Chart: Axios Visuals

Adding projected heat-related deaths into cost-benefit analysis of federal rules would tilt policymaking in favor of more aggressive carbon emissions cuts, a new study finds.

Why it matters: The social cost of carbon helps determine the outcome of cost-benefit analyses that underpin federal regulations. Adding in global warming's potential to cause more heat-related fatalities would tilt the policy calculus from supporting a gradual phaseout of emissions starting in 2050, to fully decarbonizing by the same year.

Updated 2 hours ago - Sports

In photos: Tokyo Olympics day 6 highlights

An underwater view of swimmers including Team USA's Caeleb Dressel (R) in the final of the Olympic Tokyo Games men's 100m freestyle on July 29. Photo: François-Xavier Marit/AFP via Getty Images

There's been plenty of Olympics drama on day six of the Tokyo Games Thursday — notably China's women's swimming team beating the U.S. and Australia in the record-setting 4x200-meter freestyle relay.

The big picture: Katie Ledecky helped the U.S. win silver, which also beat the previous world record smashed by China's team. Team USA grabbed two more swimming gold medals, when Caeleb Dressel won the men's 100m freestyle and Bobby Finke triumphed in the first men's Olympic 800m freestyle.