In 2018, Mr. Trump hired her and her husband, Marty Raskin, after the F.B.I. searched the home and office of Michael D. Cohen, then Mr. Trump’s personal lawyer, as part of an investigation into payments Mr. Cohen had made to silence a pornographic film star who claimed that she had had an affair with Mr. Trump. In the 1980s, Ms. Raskin worked for William F. Weld, an assistant attorney general under President Ronald Reagan, who later became the governor of Massachusetts and is now running a quixotic campaign for the Republican presidential nomination. It remains to be seen whether Ms. Raskin will have a speaking role during the Senate trial. If her history with Mr. Trump is any guide, she may remain a silent partner.

[Read more about Ms. Raskin.]

Robert W. Ray

Former independent counsel

Image Credit... Christopher Goodney/Bloomberg

Robert W. Ray succeeded Ken Starr as the independent counsel investigating Mr. Clinton in 1999. A former federal prosecutor, Mr. Ray had planned to indict Mr. Clinton when he left office for the same crimes considered during the impeachment.

But Mr. Ray and Mr. Clinton struck a deal that prevented Mr. Clinton from being prosecuted in return for surrendering his law license and paying a $25,000 fine. After leaving the federal government, Mr. Ray, 59, went into private practice. In 2006, he turned himself into the police on a low-level charge of stalking a former girlfriend. A law enforcement official said the case was sealed, suggesting it was most likely dismissed.

[Read more about Mr. Ray.]

Jay Sekulow

Mr. Trump’s personal lawyer

Image Credit... Steve Helber/Associated Press

A conservative media personality with deep ties to the evangelical community, Jay Sekulow will lead the president’s impeachment defense with Mr. Cipollone. He is one of the longest-serving members of Mr. Trump’s personal legal team, and is a frequent commentator on Fox News and on Christian television.

Mr. Sekulow, 63, was once an observant Jew, but he would embrace Christianity while attending Atlanta Baptist College, now Mercer University, where he also attended law school. In 1990, the televangelist Pat Robertson hired Mr. Sekulow as chief counsel for the American Center for Law & Justice, a group founded in opposition to the American Civil Liberties Union. In the late 1980s and 1990s, Mr. Sekulow won a string of Supreme Court cases by arguing that bans on various forms of religious expression in public places violated the right to free speech.