President Donald Trump said on Monday he put off action on raising the minimum age for gun purchases, one of several measures he had backed after the latest U.S. school shooting but skirted after heavy opposition from gun rights groups.

The proposal to raise the minimum age for buying guns from 18 to 21 was not part of a modest set of Trump administration school safety plans, which were announced on Sunday and closely aligned with National Rifle Association (NRA) positions.

The administration plan also included training teachers to carry guns in schools, an idea already in place in some states and backed by the powerful gun lobby.