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Wendy Hartling's daughter Casey was killed by an illegal immigrant from Haiti whom Immigration and Customs Enforcement had tried three times to send home.

"Casey and I were very close," her mother remembered. "She called or texted me every single solitary day."

Casey's killer had been released from jail for a previous crime, but ICE failed to come up with the necessary paperwork to send the killer home.

Now Hartling is fighting for immigration laws to be improved or at least the existing laws enforced. She believes ICE is understaffed and needs more manpower and technology at the southern border.

"Congress needs to provide funds so we can build that wall," she told "Fox & Friends" on Sunday.

The mom said she has met many people who have also lost their children to illegal immigrants.

"It's a lot more than I thought," she said.

"The first thing I learned is that you're never going to get over it," Hartling said.

The mom and daughter were planning to be certified nurse's assistants together when Casey was killed.

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