Immigration policy being at the forefront of politics is nothing new. From the nation’s founding to modern day, the policies enacted over time reveal shifting priorities. Now, President Donald Trump is using old measures to accomplish his agenda.

The Department of Homeland Security is requesting 20,000 National Guard members for help with the Trump administration's crackdown on immigration at the southern border. New York Times Pentagon Correspondent Helene Cooper and Senior Editor at The Atlantic Hanna Rosin join Katy Tur to explain more.

Pentagon lawyers are reviewing a request by the Department of Homeland Security for the Defense Department to activate 20,000 National Guard troops to enforce immigration laws.