Anti-Trump graffiti near San Diego — “Murder Trump ASAP…” has prompted an investigation. From NBC LA: Anti-Trump Graffiti Prompts Investigation. A lawyer said if the sign was meant to entice violence, then the culprit's First Amendment protection is voided. Monder said if it was meant to entice violence, then the culprit’s First Amendment protection is voided. A federal charge would be brought under Title 18 section 871, or Presidential Threat Protection Act of 2000.