Donald Trump Jr. adds DC-based attorney to legal team

She is a longtime regulatory lawyer

Lynch also confirmed to ABC News that she is joining the team.

Lynch had been at the law firm Williams and Jensen since 2000, and became a principal in 2005, according to the firm's website.

She "concentrates on legislative, regulatory, and oversight issues affecting various sectors of the health care industry and clients with an interest in education and tax policy," her bio says.