Do we have real lawyers in here?

The trademark is not registered in the US, but perhaps in another country. So why shouldn't they be able to sue him? For instance, a registered German company can sue an American citizen everywhere he wants.

Even if it's not registered in the US, the copyright holder can still file a complaint with the registrar. In most cases, the registrar doesn't want to await a trial, but will hand over the domain to the rightful owner.

Do not expect the name holder to settle with a squatter.

Domains are not copyrighted, company names are.