It's @POTUS's Constitutional Duty to Enforce Federal Law:
“‘[H]e shall take Care that the Laws be faithfully executed.’ . . . The Constitution says the president shall perform this obligation. We’re not talking about an option or something he may do or not do as he sees fit.

2) "It is a solemn duty. It is what being the chief executive is all about,” former Assistant U.S. Attorney Andrew McCarthy writes for Fox News. The Constitution says that’s the president’s job, but we’re not hearing much about that from the chattering classes.
@RealJamesWoods

3) We hear plenty of bloviating f/the media-Democrat complex, dutifully masquerading the rioting in Portland as “mostly peaceful protest.” There's no shortage of FAKE outrage over @POTUS’s purported trampling on state sovereignty b/dispatching federal agents 2 address the mayhem.

4) We don’t hear much about the Constitution … including f/politicians, like Senator Rand Paul, R., Ky., who are posing as constitutionalists.The provision quoted at the top of this tweet is from Article II, Section 3. It imposes upon our POTUS the duty 2 execute federal law.

5) PATRIOTS! We’re not talking about an option or something he may do or not do as he sees fit. It is a solemn duty. It is what being the chief executive is all about. THE LEFT DOESN'T WANT YOU TO KNOW THIS!
Law enforcement is a completely different matter! Finally~

6) Federal law enforcement agencies may & routinely do take investigative and enforcement action within the territorial jurisdiction of the states. They need NOT provide notice to, or request a for permission f/state government & its police agencies. https://www.foxnews.com/opinion/portland-riots-trump-constitution-law-andrew-mccarthy