Publicly no one with first hand experience has testified, but the Inspector General Office for the Intelligence Community independently interviewed (allegedly) over 40 witnesses with first hand knowledge, corroborating some of Grusch's claims (we have no idea the extent or what specifically). They brought their independent findings to the gang of eight (including schumer and rubio) who immediately introduced legislation to accelerate "disclosure" of the phenomenon (namely the UAP disclosure act within the DoD 2024 appropriations bill). Take from that what you will.