In one of the most recent examples, ICE officials had to release in 2012 a Haitian immigrant, Jean Jacques, who had served time for attempted murder; Haitian officials blocked his deportation because they said Mr. Jacques could not prove that he was a citizen. In June 2015, he stabbed to death Casey Chadwick, a 25-year-old woman from Norwich, Conn., and he was sentenced last year to 60 years in prison in a case that received widespread attention.
President Trump, who campaigned on cracking down on illegal immigration, had promised to punish countries that refused to take back their citizens and signed an executive order in January directing the departments of State and Homeland Security to suspend visas from countries that refused to take back their citizens.