The Columbine shootings, he said, did not hit as close to home for his colleagues in Colorado.
Some started in the wake of the Columbine shootings.
The president should also direct his senior cabinet officers to examine the effectiveness of two programs that acquired fresh energy after the Columbine shooting.
But he added that the Columbine shootings were likely to prompt changes in how the teams are trained.
To me the Columbine shootings was like the canary in a coal mine.
The song was inspired by a blanket of snow that fell on the morning after the Columbine shooting.
What did you think about the Columbine shooting and the public reaction?
The high school was closed last year for a day because of a bomb threat that occurred just a few days after the Columbine shootings.
After the Columbine shootings, most stopped wearing them for a while, but this year they are back.
But that support had slipped from 67 percent in a poll taken right after the Columbine shootings.