Sen. John CornynJohn CornynLawmakers pressure leaders to reach COVID-19 relief deal The Hill's 12:30 Report — Presented by Capital One — Pressure builds as UK approves COVID-19 vaccine Biden brushes off criticism of budget nominee MORE (R-Texas) broke with colleague Sen. Chuck GrassleyCharles (Chuck) Ernest GrassleyAlabama Republican becomes third House member to test positive for COVID-19 this week The Hill's Morning Report - Presented by Mastercard - Dem leaders back smaller COVID-19 relief bill as pandemic escalates Republican senators urge Trump to dodge pardon controversies MORE (R-Iowa) on Tuesday in saying he was "glad" that Sen. Dianne FeinsteinDianne Emiel FeinsteinFeinstein pushes for California secretary of state to replace Harris in Senate The Hill's Morning Report - Presented by Mastercard - Dem leaders back smaller COVID-19 relief bill as pandemic escalates Criminal justice groups offer support for Durbin amid fight for Judiciary spot 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."