The natives are restless. Americans of all persuasions at last agree on something. It is a message to their leaders that starts with F and ends with u.
Etymology
Originally a literal description of rebellious aboriginal inhabitants of British colonies, as in:
1868, New Zealand Parliamentary Debates: Third Session of the Fourth Parliament, Vol. 2, p. 387 (Google preview):
As to the Native question. . . . The Natives are restless, and seem desirous of fighting.