Q has mentioned the Presidential alert several times. What is the connection between a test of a National Wireless Alert System and ... well anything else?
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It only makes sense if POTUS is planning to use it.
Typically, this would be to trigger emergency procedures. Remember POTUS made September 2018 "Emergency Preparedness Month" or something like that. Maybe he's considering a confrontation in the South China Sea, for example, which could get VERY dangerous.
I do not see anything on the domestic "political" front, because I think we've got the bad guys on the run already; just taking time. Even if a number of very high profile people are arrested, Q and POTUS have prepared us for it.
The remaining possibility, I suppose, would be an attack on the infrastructure of the U.S.---power grid, water etc.---whether from internal traitors or external foes. It could be VERY IMPORTANT to cut through the FOG and get information to the people.