President-elect Trump selected Steven Mnuchin on Wednesday to serve as secretary of the treasury. Mnuchin was the Trump campaign’s national finance chairman, and the two have run in the same New York circles for decades. But disturbingly, Mnuchin has routinely donated to Democratic politicians.

Mnuchin has a long history on Wall Street, where he earned a sterling reputation and millions of dollars. Mnuchin worked for 17 years at Goldman Sachs, leaving in 2002 to become vice chairman of a longtime friend’s hedge fund, ESL. In 2003, Mnuchin worked briefly for George Soros’ SFM Capital Management before co-founding Dune Capital with other former Goldman Sachs employees.