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EPA Administrator Pruitt. Aaron P. Bernstein/Getty Images

The Environmental Protection Agency’s internal inspector general said in an internal memo that he is expanding his investigation into agency head Scott Pruitt’s air travel. A probe last year had found Pruitt's "non-commercial" flights between June and August cost taxpayers more than $58,000.

Why it matters: Pruitt and other Trump administration officials have been under scrutiny for flying charter, military or private jets paid for by taxpayers. According to the memo, published online on Wednesday, the decision to expand the scope of the probe through the end of 2017 came in response to “additional congressional requests.”

Go deeper: The Trump officials caught splurging on luxury travel

Go deeper

Caitlin Owens, author of Vitals
54 mins ago - Health

Pfizer CEO feels "liberated" after taking COVID vaccine

Pfizer CEO Albert Bourla. Photo: "Axios on HBO"

Pfizer CEO Albert Bourla tells "Axios on HBO" that he recently received his first of two doses of the company's coronavirus vaccine.

Why it matters: Bourla told CNBC in December that company polling found that one of the most effective ways to increase confidence in the vaccine was to have the CEO take it.

Dan Primack, author of Pro Rata
56 mins ago - Economy & Business

Ripple CEO: SEC lawsuit is "bad for crypto" in the U.S.

Ripple CEO Brad Garlinghouse tells "Axios on HBO" that if his company loses a lawsuit brought by U.S. regulators, it would put the country at a competitive disadvantage when it comes to cryptocurrencies.

Between the lines: The SEC in December sued Ripple, and Garlinghouse personally, for allegedly selling over $1.3 billion in unregistered securities. Ripple's response is that its cryptocurrency, called XRP, didn't require registration because it's an asset rather than a security.

Caitlin Owens, author of Vitals
1 hour ago - Health

Pfizer CEO: "It will be terrible" if COVID-19 vaccine prices limit access

Pfizer CEO Albert Bourla told "Axios on HBO" that it "will be terrible for society" if the price of coronavirus vaccines ever prohibits some people from taking them.

Why it matters: Widespread uptake of the vaccine — which might require annual booster shots — will reduce the risk of the virus continuing to spread and mutate, but it's unclear who will pay for future shots or how much they'll cost.