Americans were horrified last month when a would-be assassin opened fire on former President Trump at a rally in Butler, Pennsylvania and killed one of his supporters.

New questions were raised about the tragedy this week after a whistleblower suggested that authorities may have rigged the crime scene. 

Rooftop was scrubbed immediately after shooting

According to the New York Post, Washington Regional SWAT counter-sniper Ben Shaffer spoke with Capitol Hill lawmakers on Monday, and he agreed that "odd" behavior occurred following the assassination attempt.

Specifically, Shaffer said he was "absolutely" concerned with how the roof of the AGR International building had been quickly scrubbed.

Trump rally counter-sniper backs bombshell ‘evidence tampering’ claims by House GOPers https://t.co/6BXaYaJeX9 pic.twitter.com/C7fMFeNwWM

— New York Post (@nypost) August 26, 2024

That was the location from which gunman Thomas Matthew Crooks shot a semi-automatic rifle at the former president.

What's more, Shaffer was also puzzled by a decision to dispose of Crooks' body before an official autopsy report could be released.

Blackwater founder suspects "destruction of evidence"

The counter-sniper's remarks came at a panel discussion hosted by Arizona Republican Reps. Andy Biggs and Eli Crane, along with Florida Republican Reps. Matt Gaetz and Cory Mills as well as Texas Republican Rep. Chip Roy.

"Do you find it odd that literally only days after the attempted assassination on President Donald J. Trump, while the roof was too sloped to place individuals for counter-sniper operations, that it wasn't too sloped of a roof for the FBI to go ahead and tamper, in my opinion, with evidence by washing the roof off that may have had significant evidence on it?" the Post quoted Mills as asking Shaffer.

When Shaffer said that he did, Mills then asked if he also found "it odd … that the body of Matthew Crooks had not only been released and cremated — but that the coroner who’s responsible for releasing the body had no knowledge of it?”

"Yes, absolutely," Shaffer replied. Former Navy SEAL and Blackwater founder Erik Prince went further, stating, "It sounds like destruction of evidence."

Crooks was not question despite carrying a rangefinder scope

The Post noted that earlier in the discussion, Shaffer recalled how Crooks had been observed at the Butler Farm Show while carrying a rangefinder scope used by marksmen.

The counter-sniper indicated that this behavior should have marked Crooks as being a "person of interest" to law enforcement rather than simply a "suspicious person."

"That would warrant some type of either investigatory detention or stop-and-question," the SWAT member said of Crooks' conduct.