Former Republican presidential candidate and retired neurosurgeon Ben Carson has confirmed that he is turning down a position in Donald Trump’s cabinet.

“That is true, and I’d like to take a moment to explain why,” he explained in an email that was part of a fundraising plea for the American Legacy Center.

He went on to explain that he would be working on a program focused on the Supreme Court before asking for donations.

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“Aside from roughly one year as a candidate for President, I have been a citizen – and looking at the challenges ahead, that’s how I believe I can be most effective in helping to enact our new President’s ambitious agenda,” Carson explained.

“Rather than leading a federal department and concentrating on one issue, I feel I can have the biggest impact on the broadest number of issues by helping to lead a movement of my fellow citizens, outside of the Washington bubble,” he added.

“One way that I’ll be staying intricately involved is with the American Legacy Center, through our Fight the Court project, but likely on other topics as well.”