Senate Minority Leader Chuck Schumer, D-N.Y., sent a letter to former President George W. Bush on Friday calling on him to authorize the release of records stemming from Supreme Court nominee Brett Kavanaugh’s time working in the White House.

Schumer’s request of Bush is the latest escalation in the dispute between Senate Republicans and Democrats over the disclosure of documents related to Kavanaugh’s time working for Bush, and specifically those pertaining to his time as staff secretary.