For the same reason they can require you to have a Driver's License, be able to carry 50+lbs, live in the borders of Maryland, etc, etc.
Having the right to work in the US doesn't entitle you to a job. And there are plenty of reasons government institutions would want to disallow non-nationals a position. The whole point of citizenship is, after all, buying into the system; if you're not "in" your allegiances or potential recourse can always be argued to be limited. Dual-Citizens, such as myself, are in a similar boat for the same reasons (unless they opt to renounce foreign ties).
Just to give some additional information but there are many government jobs or government contracting jobs where you can be a dual citizen, including I believe this one.
I didn’t mean lacking the exact same job opportunities, but having their loyalties be questioned and denied from certain secure positions.
I don’t believe this job actually would be possible as the level of clearance requested is usually denied to dual-nationals (without renouncing, of course).
It wouldn't matter if they were requiring citizenship. The protected category is national origin. Companies can't normally require native-born citizenship but any company can refuse to hire non-citizens.
Citizenship is a pretty common requirement in information security in sensitive industries, to use the example I'm familiar with.
Yeah, that makes sense. Who would deny a naturalized American all the rights and privileges? I don't know what people are getting upset about; I don't see anything that says "requires a native-born US citizen."
It says "US ONLY US Citizen," but that only excludes people who still swear allegiance to King Charles.
My friend in the federal gov found your application details very curious.