All of the evidence is classified. If he would've brought out imagery or any evidence to the public, he would've been put in jail.

And it's not "hearsay" He brought 40 people with first hand knowledge to the ICIG. People who worked in the reverse engineering programs - who touched the craft.

Unlike Snowden who just released a bunch of classified information to the public, Grusch went through the proper whistleblower channels and submitted the evidence to the ICIG.

Look at my edit regarding the Senate Majority leader.