Their own countries don't want them back, so we get stuck with them because Obama wouldn't kick them out.
Via Daily Caller:
The Obama administration has released “tens of thousands” of illegal aliens convicted of crimes in the U.S. because their home countries refused to take them back.
And a “substantial number” of those involve serious crimes, a government official said Thursday during a House Oversight and Government Reform Committee on so-called recalcitrant countries.
Nations like China, Liberia and Guinea often refuse to take back their own citizens after being convicted of crimes in the U.S.
The issue entered the national spotlight here after a Haitian national named Jean Jacques killed 25-year-old Casey Chadwick last year in her Connecticut apartment after being released from prison after serving 17 years in prison for attempted murder. Immigration and Customs Enforcement (ICE) was unable to deport Jacques back to Haiti because the Caribbean nation refused to take him back.