Maybe because it is just another baseless conspiracy theory. Under trump that has been normalized looks like. From the conservative Business Daily:

"No reports of Muslim training camps, or the existence of "Islamberg" and its various offshoots, have ever been verified. The Clarion Project links to what it claims to be an FBI report detailing the activities of MOA in Houston, but the authenticity of the report cannot be confirmed. 

“It’s kind of perplexing to us,”Craig Dumont, deputy sheriff of Delaware County, New York, was quoted by World Net Daily as saying earlier this year.

"All this recent media attention in regard to potential terrorist training camps and things that are going on there. We don’t see it. We just don’t find any of that to be valid at this time. … There are no active threats that we are aware of at this time."

Neither MOA nor Jamaat ul-Fuqra has ever been designated a Foreign Terrorist Organization by the State Department"