Exactly, and because of that they have no jurisdiction.
Actually, their jurisdiction, in some forms, extends to 100 miles. In this instance, though, Portland is further than 100 miles.
I looked it up. They have special powers under certain circumstances that extends their authority throughout the US, since 9/11. The circumstance is... under a national state of emergency. Which we’re still under due to a virus, we’re beating, better than any other country, so much so we can open the economy and return to normal... but it’s still a national emergency so the president has federal officers to arrest monument vandals.