President Donald Trump’s desire to have the National Guard help patrol the Southern border is not all that different from actions taken by former Presidents Barack Obama and George W. Bush, but that does not mean there are not areas of concern about the action. 

On the latest Political Theater Podcast, Megan Scully, national security editor at CQ, breaks down the history of such border deployments and why the United States has laws preventing the military from engaging in domestic law enforcement.