Five major U.S. law firms defended agreements they reached with President Donald Trump in letters to two Democratic lawmakers, saying they did not compromise their principles in pledging free legal work to causes the White House supports.

Several large law firms sued to block the executive orders targeting them, winning temporary injunctions. Hundreds of other firms signed on in support of the effort. And on Thursday, Microsoft dropped a law firm that cut a deal with the White House, and hired one of dissenting firms to represent it in a high-profile case.