Sen. John CornynJohn CornynPoll shows competitive matchup if O’Rourke ran for Senate again On The Money: Trump declares emergency at border | Braces for legal fight | Move divides GOP | Trump signs border deal to avoid shutdown | Winners, losers from spending fight | US, China trade talks to resume next week How the border deal came together MORE (R-Texas) broke with colleague Sen. Chuck GrassleyCharles (Chuck) Ernest GrassleySenate approves border bill that prevents shutdown Grassley raises voice after McConnell interrupts Senate speech Senate confirms Trump pick William Barr as new attorney general MORE (R-Iowa) on Tuesday in saying he was "glad" that Sen. Dianne FeinsteinDianne Emiel FeinsteinFeinstein says she thinks Biden will run after meeting with him Trump judicial nominee Neomi Rao seeks to clarify past remarks on date rape Bottom Line 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."