The public interest mission of Deepak Gupta’s law firm in Washington is reflected in its three U.S. Supreme Court arguments this term—and it’s the same mission that has drawn the small firm into the first significant suit against President Donald Trump and alleged conflicts of interest.

When he launched his firm in 2012, Gupta wanted to build a premier Supreme Court and appellate boutique for plaintiffs and public interest clients. He had left the Consumer Financial Protection Bureau, where he was the agency’s first appellate lawyer. His firm today has five lawyers who are principals, one of counsel and a 2016-17 fellow.