Former Education Secretary Arne Duncan said parents should pull their children out of school until Congress passes gun control legislation.

"What if no children went to school until gun laws changed to keep them safe?" Duncan tweeted Saturday.

Duncan, who served as secretary under President Obama, called the step "tragically necessary."

"My family is all in if we can do this at scale. Parents, will you please join us?" he said.

Duncan's plea comes one day after 10 people were killed in a mass shooting at Santa Fe High School in Texas.

Duncan's not alone. The father of a child killed in the February shooting at Marjory Stoneman Douglas High School in Parkland, Fla., said gun control would be the top issue in the 2018 midterm.

"Here's what I predict: This November, this will be the No. 1 voting issue," Fred Guttenberg said on MSNBC. "And if you're wrong on this issue, we're going to fire you, because enough is enough is enough."