A so-called sovereign citizen who insisted on defending himself against charges of defrauding the Internal Revenue Service may be entitled to a new trial, the man’s standby counsel says.Gabriel A. Fuentes of Jenner & Block LLP filed a report informing the judge presiding over Hakeem El Bey’s case that there may have been an error in the jury instructions. As standby counsel for El Bey, Fuentes noted, he had “a very limited role” in the trial. And his status in the post-judgment …