800 watts or microwave energy from that far away? That's not enough to hurt you. A hair drier outputs over 1000w.
It would have to be x-ray or gamma to have an effect. But then it would work by inducing radiation poisoning, not cooking.
>military grade microwave weapons
My point remains. It's not going to be microwave based. The WH anti-surveillance people are surely monitoring the entity RF spectrum to detect listening devices. A multi-kilowatt transmitter in the WH would not go unnoticed.
>802.11 = 2.4GHz Spectrum = Microwave = Cooks Fish Sticks
When confined in a reflective box.