The technology already exists and has been deployed for complete surveillance, in real time, from existing cameras, both government controlled and civilian owned. ARGUS even has a Wikipedia page. The reason behind desiring unmanned drones is to allow the same use as overseas, targeted executions, crashing wedding parties and funerals, etc.

Here are some links to get everyone acquainted with the systems that already exist and that have been been deployed for several years now. They can already watch, they want an unmanned weapon ready platform for the future.

https://en.wikipedia.org/wiki/ARGUS-IS
https://www.genetec.com/solutions/industries/citywide-surveillance
https://ipvm.com/reports/introduction-to-city-wide-video-surveillance
https://www.duratechusa.com/Products/IVEDA/pdf/safeciti.pdf