Umar Farouk Abdulmutallab on Wednesday pleaded guilty to all eight charges he faced, including conspiracy to commit terrorism and attempted use of a weapon of mass destruction, on the second day of his trial.
Abdulmutallab had told authorities that he was working for al Qaeda in Yemen when he traveled on Northwest Airlines Flight 253 with the bomb in his underwear. The bomb didn't work, but he was badly burned.
In addition to pleading guilty, Abdulmutallab read a statement to the court denouncing the United States for its relationship with Israel and the ongoing wars overseas.
In his statement, Abdulmutallab said he was intent on blowing up the device on Flight 253 "because of the tyranny of the United States," reported ABC News.
Abdulmutallab also said Al Qaeda leader Anwar al-Awlaki inspired his actions, and claimed al-Awlaki was still alive. The U.S. military said al-Awlaki was killed in a strike on his convoy late September.
Abdulmutallab, who faces a mandatory sentence of life in prison, was expected to meet with probation officers sometime Wednesday.
The Associated Press contributed to this story.