The Democratic presidential candidate wants to overturn a 2005 law that grants immunity to gun dealers and manufacturers.
Four suspects fired 17 shots at two teenage boys in North Philadelphia over the weekend.
Gun deaths in Virginia will be 31 percent higher than road traffic deaths by 2019.
Parker's daughter was fatally shot, alongside a colleague, on live TV two months ago in Virginia.
A reporter posted the two-word quote from Bush on social media Friday afternoon.
Here's America's gun problem by the numbers.
The former Maryland governor aims to cut in half deaths from gun violence within 10 years.
No one was injured in either shooting.
Police have identified the gunman, a white male in his 50s, as John Russell Houser.