The U.S. Secret Service said Johnny Logan Spencer Jr. of Louisville wrote and posted the poem, titled "The Sniper," on a site called NewSaxon.org.
Special Agent Stephan M. Pazenzia said the poem describes a gunman shooting and killing a "tyrant," later identified as the president.
Spencer is scheduled to appear before U.S. Magistrate Judge Dave Whalin on Friday for a detention hearing. He's in federal custody charged with making threats against the president and threatening to kill or injure a major candidate for the office of the president.
