Trump’s appearance at the NRA convention came as the organization’s president, Oliver North, said he was stepping down from the position. North’s resignation came amid a power struggle with the NRA’s longtime chief executive Wayne LaPierre and after New York’s attorney general opened an investigation into the NRA’s tax-exempt status. Oliver North was a central figure in the Iran-Contra scandal, helping the Reagan administration circumvent Congress to secretly send arms to Iran and use the proceeds to fund the U.S.-backed Contras in Nicaragua.