Yes guys it has but now they are developing EMP specific weapons that are non nuclear.
These will be launched from high above in what you call a LEO (low earth orbit).
It is not a single weapon but rather a system which can direct and fire multiple EMPs so as to facilatate complete incapacitation of all enemy circuitry.
Systems like this are not in production or operable yet but are being tested.
They will eventually be able to disable ICBMs as well as SAMs. This will negate
SDI (star wars defense initiative) because we will not need laser firing satellites or missiles to intercept missiles with .
An EMP will be directed toward the incoming missile or group of missiles , and once let go it will fry all circuits in them causing them to fall out and not detonate. They can and will eventually be incorporated into fighter and attack airplanes to incapacitate surfaced fired missiles as well .
BUT as with all things our military is also developing EMP proof circuits so it will never end .
The very same co that is developing EMP weapons is also developing EMP proof items and will prolly be the one who gets both contracts to provide .