from The Conservative Treehouse:

You might ask, why is the Dept of Homeland Security (DHS) in the business of conducting widescale surveillance, monitoring and tracking of American citizens.

Unfortunately, if you are asking that question, then you likely don’t know the first, fourth and fifth amendment to the U.S. constitution were usurped by the 2001 Patriot Act.

George W Bush and Dick Cheney created the domestic surveillance system under the auspices of DHS and the Office of the Director of National Intelligence.  Barack Obama and Joe Biden then took that DHS surveillance system and modified the dials (Justice Dept., FBI) so the surveillance only applied to their ideological enemies.