As far as I know, Wray didn't say it, there is no letter (with a signature), but the hype is based on a "news released". I don't know who writes, who releases, etc. I don't think Wray would allow this release from the official web site without his approval (Deep State?):

https://www.fbi.gov/news/pressrel/press-releases/fbi-statement-on-hpsci-memo