Icahn resigned in August, in advance of a New Yorker article which detailed how he used his position in the White House and his connection to Trump to protect his investments:
One day in August, 2016, the financier Carl Icahn made an urgent phone call to the Environmental Protection Agency. Icahn is one of the richest men on Wall Street, and he has thrived, in no small measure, because of a capacity to intimidate. A Texas-based oil refiner in which he had a major stake was losing money because of an obscure environmental rule that Icahn regarded as unduly onerous. Icahn is a voluble critic of any government regulation that constrains his companies. So he wanted to speak with the person in charge of enforcing the policy: a senior official at the E.P.A. named Janet McCabe.