Hillary ClintonHillary Diane Rodham ClintonDemocratic Socialists of America endorses Sanders for president How to end the Electoral College and elect our next president by popular vote CNN town halls put network at center of Dem primary MORE issued a statement Friday marking the sixth anniversary of the 2012 Sandy Hook Elementary School shooting, which killed 26 people, the majority of them first-grade students.

The former secretary of State wrote that Americans should "keep working" until no child in the U.S. faces the possibility of gun violence at their schools.

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Clinton supported tougher gun restrictions during her unsuccessful 2016 campaign for president, including expanded background checks for gun purchases and a ban on assault weapons.

The Trump administration commissioned a panel this year on school safety in response to the deadly shooting at a Parkland, Fla., high school, which is set to release its recommendations for improving school safety before the end of December.

It has been reported that the commission is likely to endorse Trump-supported positions such as arming teachers while declining to endorse an increase in the age limit for firearm purchases.