The free market think tank Unleash Prosperity released a report highlighting the role of immigration in boosting the U.S. economy, though not all in President Donald Trump’s base were won over by its data.

The report’s authors, Richard Vedder, professor emeritus at Ohio University; Matthew Denhart, president of the Calvin Coolidge Presidential Foundation; and Unleash Prosperity founder Stephen Moore highlighted the positive economic impacts of immigration. In a Tuesday press conference, Vedder laid out their arguments for why the U.S. should increase immigration on economic grounds.