"He must... be an expert in deceiving his audience and the entire nation. In the democratic system, the first station to test his reprehensible talent (lying and deceiving) is the election campaign. If he succeeds in this, then he will practice it during his presidency in the Oval Office and around the world."
From the January 2015 letter from Khalid Sheik Mohammed to "the head of the snake," Barack Obama.
Here's a PDF of the whole letter.