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Photo: Mandel Ngan/AFP via Getty Images

Mandy Gunasekara, who has been instrumental in crafting President Trump’s regulatory rollbacks on a range of air pollution standards, is leaving the Environmental Protection Agency to start a new political advocacy group defending those policies.

Driving the news: Gunasekara, deputy assistant administrator in EPA’s air office, is sending her resignation letter to Trump Friday, according to a copy viewed by Axios. 

What’s next: In her letter to Trump, Gunasekara didn’t get into details about her new organization other than to say it will defend “you and the many energy, regulatory and economic successes of your bold and pragmatic agenda.” It’s expected to be a nonprofit with a c(4) tax status, which means, among other things, that its donors can be anonymous. 

The big picture: Gunasekara, who describes herself in the letter as a conservative Mississippian, is one of several Trump administration officials in the environmental space who used to work for Sen. James Inhofe (R.-Okla.). Inhofe has been one of the most outspoken lawmakers who does not acknowledge the scientific consensus that human activity is a main driver of global warming.

Go deeper:

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Neera Tanden withdraws nomination for Office of Management and Budget director

Neera Tanden testifying before the Senate Budget Committee in Washington, D.C., in February 2021. Photo: Anna Moneymaker/The New York Times/Bloomberg via Getty Images

Neera Tanden withdrew her name from nomination to lead the Office of Management and Budget after several senators voiced opposition and concern about her qualifications and past combative tweets, President Biden announced Tuesday.

Why it matters: Tanden’s decision to pull her nomination marks Biden's first setback in filling out his Cabinet with a thin Democratic majority in the Senate.

What's ahead for the newest female CEOs

Jane Fraser (L) and Rosalind Brewer. Photos: Jason Redmond/AFP via Getty Images; Rodrigo Capote/Bloomberg via Getty Images.

The number of women at the helm of America’s biggest companies pales in comparison to men, but is newly growing — and their tasks are huge.

What's going on: Jane Fraser took over at Citigroup this week, the first woman to ever lead a major U.S. bank. Rosalind Brewer will take the reins at Walgreens in the coming weeks (March 15) — a company that's been run by white men for more than a century.

3 hours ago - Health

Biden says U.S. will have enough vaccines for 300 million adults by end of May

President Biden. Photo: Anna Moneymaker-Pool/Getty Images

President Biden on Tuesday said that ramped-up coronavirus vaccine production will provide enough doses for 300 million Americans by the end May.

Why it matters: That's two months sooner than Biden's previous promise of enough vaccines for all American adults by the end of July.