Trump tweeted a picture on August 30th, which appears to be a picture of a
screen judging by the shadow on it, of the Iran launch site after the Safir
launch failure. Experts were able to determine based on analysis of the photo
with existing satellite data from Google maps, they were able to determine that
a specific US satellite (USA 224) was at a similar azimuth and elevation around
the time the photo was taken.
This turned out to be a KH-11 Keyhole survelliance satellite.