Rep. Trey Gowdy (R-S.C.) is accusing the Obama administration of a massive cover-up in the deadly Benghazi terrorist attack, saying it was “dispersing” witnesses around the country and changing their names in an effort to hide the truth about what happened.

In an inteview Thursday with Fox News host Greta Van Susteren, Gowdy said the administration is “changing names, creating aliases” of U.S. agents who were in Benghazi on the night of the Sept. 11, 2012 attacks.

“Stop and think what things are most calculated to get at the truth? Talk to people with first-hand knowledge. What creates the appearance or perhaps the reality of a cover-up? Not letting us talk with people who have the most amount of information, dispersing them around the country and changing their names,” Gowdy said.