President Donald Trump signed an executive order Thursday afternoon focused on speeding up the reclassification of marijuana from Schedule I to Schedule III and driving new research into the medical uses of hemp-derived THC and CBD products.

Though Trump made his stance on the issue abundantly clear last year, a number of Republicans have pushed back on his push to reschedule marijuana in recent weeks. Ahead of the president’s announcement, a group of 24 Republican lawmakers sent a letter to the president begging him to maintain marijuana’s Schedule I designation.