Trump has eliminated the loopholes that Obama used to allow many criminals to stay. From the Washington Examiner:
President Trump’s executive order on the enforcement of immigration laws calls for a dramatically more aggressive stance on removing illegal immigrants compared to the Obama administration, and will now subject virtually all illegal immigrants to deportation if they have had any run-in with the law.
Obama drew complaints from Republicans when he created the Priority Enforcement Program, or PEP, which was ordered by Obama and announced in the form of a memo from then-Homeland Security Secretary Jeh Johnson. PEP gave local law enforcement officers broad discretion when it came to reporting someone in custody to U.S. Immigration and Customs Enforcement, and told immigration officials to stand down on deporting a criminal alien because his or her criminal history was still minimal.
Trump’s executive order changed all that, by removing the tier system and saying priorities are any illegal immigrant who has had any scrape with the law. Trump’s order effectively eliminates the wiggle room officials could use to avoid deportations, which was a major theme of the Obama-era policy.