The plan includes "rigorous" firearms training for some school officials, support for a bill to strengthen background checks for gun purchasers and the creation of a task force to study school shootings.
White House spokesman Raj Shah had said earlier Sunday in an interview with ABC's "This Week" that "the president has been clear that he does support raising the age to 21" and that that would be a "component" of the announcement.
DeVos characterized the administration's efforts as "a pragmatic plan to dramatically increase school safety". Education Secretary Betsy DeVos will chair the commission, which will then provide recommendations to the president.
The commission would look at a "wide range" of ideas in order to ensure that "no student or family should ever have to live the horror of Parkland or Sandy Hook ever again", FOX News reported that DeVos said in a statement.
Avery Gardiner, co-president of the Brady Campaign to Prevent Gun Violence, said: "Americans expecting real leadership to prevent gun violence will be disappointed and troubled by President Trump's unsafe retreat from his promise".
Mr Trump tweeted on Monday: "On 18 to 21 Age Limits, watching court cases and rulings before acting".
Rep. Stephanie Murphy said Tuesday she was at the table with President Donald Trump when he held his meeting on school safety and mocked lawmakers for being afraid of the National Rifle Association, and she finds it "disappointing" that his proposals on guns fall "way short" of what was expected. "He backed off his openness toward an assault weapons ban, support for expanded background checks, barring those who exhibit "red flags" from buying guns and raising the age to buy an assault weapons to 21". But you can buy the kind of weapon used in the school shooting at 18. 'I think what Senator Feinstein is asking there - when we talk about just DACA, we don't want to be back here two years later. That means it's up to the states to take meaningful steps on gun issues.
"His initiative basically amounts to a big nothing", he said of Trump.
Administration officials demurred Sunday night when asked why Trump found commissions an inadequate response to the drug epidemic but an appropriate way to respond to gun massacres.
Trump seemed to be playing his part. Since nearly immediately after the Parkland shooting, the president has advocated arming some teachers as a solution to stopping future massacres. One group of Republicans were told that Trump, speaking about seizing guns from mentally ill people who could pose a threat, had said, "A lot of times, by the time you go to court, it takes so long to go to court to get the due process procedures".
Meantime, the President continues to fight to put more guns in the hands of more teachers and other school staff, insanely selling it as something close to a silver bullet to solve mass shootings.
"The president has rallied world powers in support of increasing economic and diplomatic pressure".
Trump is backing a bipartisan Senate bill by Senate Majority Whip John Cornyn, R-Texas, and Sen.
"The president, as you know, doesn't have the ability to just create federal law, and he would need a number of other individuals to come together to help make that happen", Sanders said.
Lastly, the administration wants to better integrate mental health, primary care and family services programs, and the president has ordered a full audit and review of the Federal Bureau of Investigation tip line, he said.
Gun-control advocates said the president missed a crucial opportunity to lead.