Evidence continues to mount that Saturday's attempted assassination of Donald Trump by shooter Thomas Matthew Crooks was allowed to happen, despite ample warning from bystanders, local PD, and even the shooter's parents.

To review:

And now for the kicker: 

After Crooks was positioned on the roof, one cop boosted another cop up to the roofline - only for Crooks to point his weapon at him. At that point, the boosted cop fell.

Both of them radioed the threat on a "blanket tactical channel" before the shooting, on which "everyone who was on the tactical channel heard it" according to Butler Township manager, Tom Knights.

"The boosting officer and the officer that fell were both on the radio indicating that there was an individual on the roof that did, in fact, have a weapon," said Knights. "There was a blanket tactical channel being used. Everyone who was on that tactical channel heard it."

Watch (via @KanekoaTheGreat):

It is unknown how much time passed between that radio communication and when shots rang out - or whether the Secret Service was on the "blanket tactical channel" (one would assume). But there was ample knowledge of the armed guy trying to kill Trump before he began shooting. 

We're sure Congress will get to the bottom of this...

...or not: