The Senate Judiciary Committee sent a bipartisan letter to Jared Kushner’s attorney Thursday alleging that the production of documents the committee has requested Kushner turn over as part of its Russia probe was “incomplete.”

According to committee chair Chuck Grassley (R-IA) and ranking member Sen. Dianne Feinstein (D-CA), Kushner did not turn over a Wikileaks-related email forwarded to him; a document Kushner forwarded about a “Russian backdoor overture and dinner invite”; and communications with Russian-American Chamber of Commerce President Sergei Millian on which Kushner was copied.

These are among “several documents that are known to exist but were not included in your production,” the senators said.

“We appreciate your voluntary cooperation with the Committee’s investigation, but the production appears to have been incomplete,” the letter said. “In addition, you asked for clarification on the scope of the request. Therefore, we write today to clarify the scope and reiterate our requests for documents.”

The senators added that Kushner has not turned over his phone records that the senators “presume exist and would relate to Mr. Kushner’s communications regarding several requests.”

They are also seeking transcripts from Kushner’s interviews with the other congressional committees investigating Russia’s election interference, as well as documents related to his security clearance applications (which Kushner had to amend several times due to omissions of certain foreign contacts).

A whole section of the letter is devoted to documents requested related to Kushner’s communications with former National Security Advisor Mike Flynn.

Separately, the senators addressed a concern Kushner apparently raised that turning over some of the documents they’d requested would “implicate the President’s Executive Privilege.”

“We ask that you work with White House counsel to resolve any questions of privilege so that you can produce the documents that have been requested or provide a privilege log that describes the documents over which the President is asserting executive privilege,” they said.

Read the full letter below: