Conversation so far:
What was the reason behind the Anwar al-Awlaki lawsuit?
The lawsuit sought to remove Anwar al-Awlaki from the targeted killing list.
Why was Anwar al-Awlaki on the targeted kill list?
In April 2010, Anwar al-Awlaki was placed on a CIA kill list by President Barack Obama due to his alleged terrorist activities.

Question: what was his argument in the trial?
Self-contained rewrite: What was Anwar al Awlaki's argument in the trial against the US?