He said he would be "much more comfortable" if teachers were trained and armed.
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Move is intended to address overcrowded prisons and give relief to drug offenders.
Sen. Marco Rubio (R-Fla.) laughed off the heckler, calling the incident "kind of weird."
The president will also travel to Oregon later this week.
"I would say 'Hey, guys, everybody attack him!' "
Rubio says many laws under discussion would not prevent gun violence.
President Obama is heading to Roseburg, Ore., on Friday to visit the families of the victims from last week's shooting at a community college there.
Obama was already ...
"Since you’re always sweating, we thought you could use some water."
Carson sought to discuss ways to check Putin's power instead.
Erickson is leaving the blog he helped popularize at the end of the year.