Why is it so hard to deport Criminal Illegal Immigrants?

I brought up this problem up back in May  and since then, another cop was killed by an illegal immigrant drunk driver with a rap sheet. This time in Pheonix:

As the House and Senate continue to debate overhauling America's immigration system, new differences are emerging between the two chambers over how to handle criminal illegal immigrants.

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The controversy is emerging after two police officers were killed, allegedly by illegal immigrant drunk drivers with prior DUI arrests. 

"There are thousands of Americans killed intentionally and accidentally by illegal immigrants who have already been arrested and could have been deported from the U.S.," said Kris Kobach, an attorney representing Immigration and Customs Enforcement agents who claim the Obama administration is preventing them from deporting law-breakers. 

In Houston, police say 23-year-old Andres Munos was driving drunk on May 20 when he struck and killed 47-year-old Sgt. Dwayne Polk, a Harris County sheriff's deputy. Munos, who is in this country illegally, was previously arrested in 2010 for drunk driving and unlawful carrying of a weapon.

In Phoenix, Jesus Cabrera-Molina admitted he was drunk and high on cocaine the night his SUV struck and killed Phoenix Police Officer Daryl Raetz -- but he denies he was behind the wheel. Witnesses disagree, and Phoenix police have charged Molina with manslaughter.

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