The op-ed set off frenzied speculation about the identity of the anonymous author, and prompted politicians to respond.
Trump has strongly advocated supplying "firearms adept" teachers with guns to deter potential shooters.
Trump started to call for modest gun control measures following the shooting massacre of 17 people at a Florida high school last week.
Trump has tried to balance a desire to take action on gun rules with keeping his political base happy.
Sen. Al Franken plans an announcement Thursday after new allegations and growing calls for his resignation.
Former Michigan Gov. Jennifer Granholm said the plan was a "giveaway to the ultra-rich winners of the ovarian lottery."
Democrats protested the GOP health plan Tuesday during the Senate drug pricing hearing, interrupting the Republican agenda.
Donald Trump creates another firestorm when he seems to suggest violence as means of preventing Hillary Clinton from nominating judges.
Led by Civil Rights veteran Rep. John Lewis, House Democrats are trying to force a vote on gun control, NBC News reports.