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6 year oldSpeaking at the White House, Mr Trump said he had directed the Department of Justice to propose a law to make the accessories illegal.
"We have to do more to protect our children," he said, adding that he would discuss school safety this week.
Last week a 19-year-old killed 17 people at his former Florida school.
At an event on Tuesday recognising the bravery of law enforcement, Mr Trump said he had directed Attorney General Jeff Sessions to finalise new guidelines to declare bump stocks illegal "very soon".
The accessories can make semi-automatic rifles fire as rapidly as machine guns.
They can be bought for as little as $100 (£70) without the need for a criminal background check.
The device was used by a 64-year-old gambler who rained bullets on a crowd at an outdoor country music festival on the Las Vegas Strip in October last year.
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