A new study just debunked Trump’s favorite talking point about undocumented immigrants

The report knocks down one of Trump’s most popular xenophobic talking points.

A growth in the undocumented immigrant population is not associated with an increase in local crime, according to a new study from The Marshall Project. The findings directly contradict one of the president’s favorite talking points about immigrants and crime.

This study, which focuses squarely on undocumented immigrants, uses local crime rates published by the FBI and concluded that between 2007 and 2016, almost every type of crime had a flat line trend, suggesting that any increase in undocumented immigrants has had no effect on crime. Areas with higher rates of illegal immigration actually appeared to have a slight drop in the crime rate.

Studies on undocumented immigrants are relatively rare, in part because it’s hard to collect data on them. While it is difficult to estimate the exact number of undocumented immigrants in the United States, the most recent available data from the Department of Homeland Security (DHS) is from 2016 and puts the population roughly at 10.7 million, down a million and a half from 2007.