Trento told TPM in a phone interview that he caught Khan in an "outright bold faced lie" about the existence of the Muslim Brotherhood in America.
"We know that he knows it exists," Trento said, adding that a website has been set up called "Suhail Khan Exposed" that offers "documentation of our public position." He said he's "not totally sure" who put the website up, but believed it was a "coalition" of people.
"When you say that a former United States official is lying publicly, it is incumbent upon that person to have some sort of evidence and that evidence is documented on that website," Trento said.
His fundraising e-mail stated that Khan "comes from a family and network of Muslim extremist sympathizers and activists."
"His father, Mahboob Khan, was one of the founders of both the Islamic Society of North America and the Muslim Student Association," Trento wrote. "Both organizations led to the rise of the Muslim Brotherhood in America and Khan's family has been involved from the beginning."
"And it's no secret that Khan has become a major player on Capitol Hill attempting to influence and infiltrate lawmakers and government operations in Washington!" he asserted.
"Let's face it, Suhail Khan is part of a larger effort by Muslim extremists and the Muslim Brotherhood to infiltrate all levels of government and society with the goal of someday imposing Saudi-style Shariah law," Trento added.
"The Muslim Brotherhood is here and operating in America and sympathizers like Suhail Khan is giving them cover. They must be exposed and they must be stopped!"
Then comes the pitch for cash.
"The Florida Security Council needs your financial support today to continue our mission to expose the Muslim Brotherhood in America. Our work at the national level has uncovered the deceptive tactics being used by members of the Muslim Brotherhood to penetrate society and even conservative organization like the American Conservative Union."
The e-mail also name-drops Frank Gaffney, who was banned from CPAC because of the baseless allegations he made against ACU board members Khan and Grover Norquist.