Sen. John CornynJohn CornynMental health: The power of connecting requires the power of investing Senators call for Smithsonian Latino, women's museums to be built on National Mall Cornyn says he 'would be surprised' if GOP tries to unseat Sinema in 2024 MORE (R-Texas) broke with colleague Sen. Chuck GrassleyChuck GrassleyGraham emerges as go-to ally for Biden's judicial picks Iowa Democrat drops bid to challenge Grassley after death of nephew Bipartisan senators press FBI, inspector general for changes following Nassar case MORE (R-Iowa) on Tuesday in saying he was "glad" that Sen. Dianne FeinsteinDianne Emiel FeinsteinProgressive groups urge Feinstein to back filibuster carve out for voting rights or resign Senators call for Smithsonian Latino, women's museums to be built on National Mall Five faces from the media who became political candidates MORE (D-Calif.) released the Senate testimony of Fusion GPS co-founder Glenn Simpson. 

“I think that’s a good idea," Cornyn said. "I’m glad that it was done.”

"I respect Chairman Grassley, and I don't really understand how this happened, but I do think more transparency is important," Cornyn said. 

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A spokesman for Grassley, the chairman of the Senate Judiciary Committee, issued a statement saying it was "confounding" that Feinstein would release a transcript of the panel's interview with Simpson in the middle of an investigation.

"It’s totally confounding that Senator Feinstein would unilaterally release a transcript of a witness interview in the middle of an ongoing investigation — a witness that Feinstein herself subpoenaed last year for lack of cooperation," Grassley's press secretary said in a statement. 

The committee interviewed Simpson in August as part of its wider investigation into Russian interference in the 2016 election. 

The chairman's spokesman said that while Grassley advocates transparency during the investigation, the unilateral decision by the Democrats to release the transcript "jeopardizes" the committee's ability to secure future voluntary witnesses in its investigation. 

Cornyn said that he thinks Grassley "has a point" in not wanting to show the committee's full hand before its investigation is through, but said, "I'm glad it's out."