Neomi Rao has been sworn in as US Circuit Judge for the District of Columbia Circuit Court of Appeals. (Photo: Reuters)

Neomi Jehangir Rao, a prominent Indian-American lawyer, has been sworn in as US Circuit Judge for the District of Columbia Circuit Court of Appeals, becoming the second from the community to be a part of the powerful court considered next only to the US Supreme Court.

Rao, 45, was sworn in by US Supreme Court Justice Clarence Thomas in the Roosevelt Room of the White House on Tuesday. She will replace US Supreme Court Judge Justice Brett Kavanaugh who was nominated by President Donald Trump for the top post.

Before being sworn in as the US Supreme Court Judge, Kavanaugh, whose confirmation process was marred by sexual misconduct allegations, was a judge at the United States Circuit Judge of the United States Court of Appeals for the District of Columbia Circuit.

Joined by her husband Alan Lefkowitz, Rao took the oath on the Bible.

According to a White House schedule, Trump participated in the swearing-in ceremony.

Born in Detroit to Parsi physicians from India - Zerin Rao and Jehangir Narioshang - Rao is the second Indian-American after Sri Srinivasan to be part of the powerful court said to be next only to the US Supreme Court.

Srinivasan was appointed during the previous Obama regime.

Nominated by President Trump during Diwali celebrations last November, Rao was confirmed by the Senate last week by 53-46 votes.

"She is going to be fantastic. Great person," Trump had said about his nominee.

In her previous role as the Administrator of the Office of Information and Regulatory Affairs (OIRA) of the Office of Management and Budget, she played a key role in regulatory reform.

Rao's confirmation and her swearing-in for the prestigious court has been a low key affair for the Indian-American community.

This is in stark contrast to the nationwide celebration by Indian-Americans when Srinivasan was confirmed and sworn in as US Circuit Judge for the District of Columbia Circuit.

Prior to her service as OIRA Administrator, Rao was a professor of structural constitutional law, administrative law, and legislation and statutory interpretation at the Antonin Scalia Law School at George Mason University.

She founded the Law School's Center for the Study of the Administrative State and focused her scholarship on the political and constitutional accountability of administrative agencies and the role of Congress.

She has served in all three branches of government, including Associate Counsel and Special Assistant to President George W Bush.

Rao also served as counsel to the Senate Committee on the Judiciary, where she was responsible for judicial nominations and constitutional law issues.

In between government service, Rao practised in the London office of Clifford Chance LLP, specialising in international law and commercial arbitration.