Loony goldbugs said the gold wasn't there, so a few politicians visited the 'stack' at Fort Knox and had their photos taken with it. In addition people visit another portion of the USA 'stack' every day at the Federal Reserve Bank in New York.
Only nutters say it's not there. Goldbugs really are the most eccentric lot out there.
https://www.newyorkfed.org/aboutthefed/visiting