The decision by Democratic Sen. Dianne Feinstein to make public 300 pages of testimony related to a controversial dossier drew a rebuke from the Judiciary Committee’s Republican chairman but was welcomed by other GOP colleagues.

Glenn Simpson, the founder of Fusion GPS, was questioned in August 2017 by Judiciary Committee investigators about the dossier commissioned by his firm, which contained salacious and unverified material on President Donald Trump’s purported ties to Russia. Last week, Mr. Simpson had publicly called for his testimony to be released. At the same time, Capitol Hill Republicans have been pushing for deeper investigations into Fusion GPS.

Ms. Feinstein said she was releasing the transcript in part to rebut charges that Mr. Simpson had acted inappropriately.

“The innuendo and misinformation circulating about the transcript are part of a deeply troubling effort to undermine the investigation into potential collusion and obstruction of justice. The only way to set the record straight is to make the transcript public,” the California senator said in explaining her decision.

Mr. Trump, in a tweet Wednesday, called her move a “disgrace.”