Addressing Obama as "Barack," Gadahn released his comments and a video on the Internet Sunday, the Middle East media Research Institute reported. CNN, saying it couldn't confirm the transcript or video's veracity, reported the text and video were posted on several Web sites supportive of, or backed by, terrorist groups.
"I know that as you slither snakelike into the second year of your reign as a purported president of change, you are finding your hands full with running the affairs of a declining and besieged empire and -- in the process -- proving yourself to be nothing more than another treacherous, bloodthirsty and narrow-minded American war president … ," Gadahn said.
Gadahn criticized what he called U.S. "aggression and interference" in Afghanistan, Pakistan, Yemen and Somalia, as well as transferring "captive brothers" from detention centers around the world to "Muslim-only concentration camps in Illinois, Bagram (Airfield, Afghanistan) and elsewhere -- all in the name of protecting the American people from the threat of Muslim retaliation for American crimes."
The Obama administration is considering housing terror detainees in a maximum-security correctional facility in Thomson, Ill.
U.S. efforts against terrorists won't succeed in improving security and protecting the United States, Gadahn said, adding, "they are actually detrimental to America's safety and stability."
"And honestly, Barack, as a president who has proven himself to be incapable of keeping intruders out of his own executive mansion, do you really expect anyone to believe that you will be successful in your attempts to keep the mujahedin away from an entire continent?" the video asked.
In March, Gadahn reportedly was arrested by Pakistani investigators after Web sites posted a video of him lauding the suspect in the Fort Hood, Texas, massacre in November. However, the Pakistani government later backed away from the reports.
CNN reported the U.S. government has offered a $1 million reward for information leading to the capture of Gadahn, the first American charged with treason since 1952.
Notable deaths of 2014 [PHOTOS]