ABM interceptors have as previously mentioned been a thing since the late 50s when the plan was to use nukes to prematurely set off incoming nukes via massive neutron flux. This is how the Russian ABM system around still functions btw. Precision kinetic interceptors have been a work in progress since the 70s and are deployed on both coasts.
Trump also promised a "beautiful" wall, paid for by Mexico, and the parts that did get built were substandard pieces of shit even by Trump construction standards. Easily scaled with a cheap ladder.
He promised a bigly and betterer public health system, and what his administration did manage to produce was a big bound book of blank pages as a set piece. Still has not coughed up any real policy.
He promised to bring back production from overseas, and instead got in a tradewar with the EU.
It is almost like promises made by a compulsive liar are worthless.