US budget watchdog estimates Golden Dome will cost $1.2T

While the administration's estimate is absurd, even $1.2 Trillion seems rather low. For comparison the Sentinel ICBM program, replacing the current Minuteman III missiles, which are just one prong of the nuclear triad, with a missile with similar capabilities is estimated at $140 Billion.

I thought Ronald Regan already built this when he was president.

is this pre-grift evaluation?