I don't want them to have the "power to arrest" then. (Anyway, what is "domestic law enforcement" if it isn't the "power to arrest"? I don't see the difference).
Also, do you realize who the feds consider to be a "domestic terrorist"? I'll give you a hint-- it's not some murderous goblin from Iraq.
The "power to arrest" isn't going to do anything to stop foreign terrorists here. What we need is "power to stop", i.e., the recognition of the government that Free Americans have the Right to bear arms to defend ourselves.
If the government is truly interested in "stopping the terrorists", then enact a nationwide CCW law that protects the Rights of Free men and women to bear arms against any force that would do them harm.
But they aren't interested in preventing terrorism. They are only interested in instituting a totalitarian police state, using terrorism (which they allow to happen) as an excuse.