President Trump's border czar, Tom Homan announced today that roughly 700 immigration officers

will be withdrawn from Minnesota after what he described as unprecedented cooperation from local law enforcement.

But about 2,000 agents are still expected to remain on the ground for what he described as targeted operations.

During an interview with NBC News today, President Trump was asked why he directed

Holman to withdraw some of the officers and what he had learned from Minneapolis.

I learned that maybe we can use a little bit of a softer touch, but you still have to be tough.

These are criminals. We're dealing with really hard criminals.

In Minneapolis and elsewhere, there continue to be real concerns about ICE's tactics.

William Brangham focuses on that part of the story.

That's right, Jeff.

Holman's announcement comes amid ongoing intense protests about the use of force by ICE agents and the fatal shootings by them of Renee Good and Alex Preti.

But there's a whole other set of tactics that immigration officials are using to track suspects and protesters.

This growing surveillance arsenal includes facial detection apps and databases, cell phone trackers, and protesters. This growing surveillance arsenal includes facial detection apps and databases,

cell phone trackers, and drones. For more on how this technology is being deployed on U.S.

streets, we are joined by Joseph Cox of 404 Media. Joseph, thank you so much for being here.

You have been covering all these different technologies that ICE agents are using

and how they're able to scoop up information about people without them really knowing what they are doing.

Let's talk about some of those technologies.

One of them is called Webblock.

Explain what that is, what it does.

Yeah, so Weblock allows ICE to track the location of mobile

phones without a warrant, crucially. Now, this data is not coming from the telecoms. It is not coming

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