How states are fighting Trump's child separation policy

New York Governor Andrew Cuomo
New York Governor Cuomo. (Photo by Drew Angerer/Getty Images)

Several governors vowed Tuesday not to deploy their state National Guards to the southern border, bringing the total number of governors retaliating against the Trump administration's hotly-contested child separation policy to seven.

Why it matters: Despite the policy's sweeping federal power, these governors are using their state governments to fight the administration's decision.