Even the $1 trillion was a massive scale back as he claimed "at least $2 Trillion" from cutting "waste":

https://www.bbc.co.uk/news/articles/cdj38mekdkgo

> The boss of Tesla and the social media site X, Elon Musk, suggested last month at Donald Trump’s rally in New York City that it would be possible to cut “at least $2 trillion” from US government spending by eradicating “waste”.