I remember Grassley sent at least one.
I dont recall the House sending a referral.
Committee referrals to the DOJ included Hillary Clinton, Christopher Steele, James Comey, Loretta Lynch, Andrew McCabe, and others.
Committees make criminal referrals somewhat often.
Referrals have no legal status and the DOJ retains absolute prosecutorial discretion in investigation and prosecution. It’s up to the Executive Branch.
Specifically, they sent criminal referrals to Sessions for: former FBI Director James Comey, former Secretary of State Hillary Clinton, former Attorney General Loretta Lynch, former FBI Deputy Director Andrew McCabe, as well as FBI Special Agent Peter Strzok and his lover, FBI lawyer Lisa Page, for separate violations.
The criminal referrals, first reported by investigative journalist Sara Carter, were made by Rep. Ron Desantis (R-FL), a senior member of the House Judiciary and Oversight and Government Reform Committees who is leaving the House to run for Florida governor, and ten other colleagues.
Signatories included: GOP Reps. Andy Biggs (AZ), Dave Brat (VA), Jeff Duncan (SC), Matt Gaetz (FL), Paul A. Gosar (AZ), Andy Harris (MD), Jody Hice (GA), Todd Rokita (IN), Claudia Tenney (NY), and Ted Yoho (FL).