Mr. Arpaio was charged with a misdemeanor , a petty offense and yet was denied a Jury Trial as is his right under the Sixth Amendment which states , in part:  
"In all criminal prosecutions, the accused shall enjoy the right to a speedy and public trial, by an impartial jury of the State and district wherein the crime shall have been committed,"   US Constitution , Bill of Rights.    There are no exceptions to this .

It seems as if the judge who found him guilty needs a lesson in following the Rule of Law and so does Senator McCain