Mexican journalist and long-time UFO enthusiast Jaime Maussan showed politicians at the hearing on Tuesday two tiny "bodies" displayed in cases, with three fingers on each hand and elongated heads.
He claimed they were found in Peru in 2017 and were not related to any life on Earth.
The images from the congressional hearing, the first of its kind in Mexico, sparked international curiosity as well as substantial scorn.
Maussan, speaking to Reuters on Thursday, said his critics had yet to present evidence to counter his claims.
"If you have something strange, make samples available to the world's scientific community, and we'll see what's there," he said.
Persons:
Henry Romero, Jaime Maussan, Maussan, Ryan Graves, Graves, Leslie Urteaga, Urteaga, David Spergel, Cassandra Garrison, Joey Roulette, Marco Aquino, Rosalba O'Brien, Sandra Maler
Organizations:
San, REUTERS, U.S . Navy, Mexico's National Autonomous University, UNAM, Peruvian Culture, Ministry of Culture, Reuters, National Laboratory, NASA, Princeton, Thomson
Locations:
San Lazaro, Mexico City, Mexico, MEXICO, Peru, Mexican, Washington, Lima