POSTED: Friday, February 15, 2013 - 6:30pm
UPDATED: Friday, February 15, 2013 - 6:34pm
NATIONAL NEWS (CNN) — In a city notorious for gun violence, President Barack Obama will continue his push for tougher laws on Friday amid questions about whether a key proposal to ban semi-automatic weapons that mimic military assault rifles would address the issue of handguns involved in most killings.
Obama will speak at Hyde Park Academy High School in Chicago, the city where Hadiya Pendleton, 15, was killed by gunfire last month. She had just returned from Washington, where she had taken part in inaugural activities.
Obama headed to his hometown after a White House ceremony to award the Presidential Citizens Medal -- the nation's second-highest civilian honor -- to 18 people. They included posthumous honors for six educators killed along with 20 first-graders in December's Connecticut school massacre.
He hugged family members of the slain teachers and administrators from Sandy Hook Elementary School in presenting the medals, saying: "We could not be more grateful to your loved ones, who gave everything they had" for the children in their care.
The emotional moment followed Obama's dramatic call in his State of the Union address on Tuesday for Congress to vote on his package of gun measures.
"They deserve a vote," he said repeatedly, referring to victims of gun violence and their families. Pendleton's parents sat with first lady Michelle Obama during the speech at the Capitol.
Fierce opposition by the National Rifle Association makes passage of any significant gun legislation uncertain. In response to Obama's address, the NRA has sought to discredit the motives and impacts of legislation proposed by the president and Democrats.
"They only care about their decades-old gun control agenda --- ban every gun they can, tax every gun sold and register every gun owner," NRA chief executive Wayne LaPierre said in a statement on Thursday. "This president has taken the art of public deception and manipulation to a whole new level."
Obama seeks an updated version of the 1994 assault weapons ban, which expired in 2004, that would prevent the manufacture and sale of some semi-automatic rifles modeled after fully automatic assault weapons.
He also proposes limiting ammunition magazines to 10 rounds, expanding background checks to all gun transactions, including sales at gun shows. He also wants Congress to take steps to better screen people with mental illnesses, so they cannot obtain weapons.
Legislation proposed so far also would crack down on so-called straw purchases, in which a legal buyer purchases weapons for distribution to non-legal buyers.
The NRA and other opponents argue the Democratic proposals are veiled attempts to limit gun ownership and eventually take away weapons, and therefore violate the constitutional right to bear arms.
In particular, opponents contend the proposed ban on semi-automatic rifles focuses on a weapon used in a tiny percentage of killings and other gun violence.
Harold Pollack, co-director of the University of Chicago Crime Lab, confirmed on Friday that so-called assault weapons targeted by the proposed ban account for a small fraction of murders in the United States.
However, Pollack said the ban proposed by Obama can help reduce gun violence, especially what he called the psychologically impactful mass shootings such as the Newtown attack in which a lone gunman used a Bushmaster semi-automatic rifle.
The combination of such weapons with high-capacity magazines "facilitates mass homicides," Pollack told CNN, noting that professional criminals generally don't use such rifles that look like military weapons.
"The people who do use these weapons are often the most dangerous or most sociopathic," Pollack said. The Newtown shooter, a 20-year-old man living with his mother, took her legally owned guns and killed her before going to the school to open fire on students and teachers.
To Pollack, such a mass killing -- while relatively rare -- "traumatizes communities and the entire society in a way that demands attention."
To the NRA, that attention should be putting armed guards at every school, rather than seeking to limit the ability of people to obtain weapons. It also calls for tougher enforcement of existing gun laws, which Pollack agreed was necessary.
"A lot of the underground gun market could be stopped if we treated guns with the same amount of determination and tools as the drug market," he said.
For example, Pollack noted how committing a crime with a gun brought additional charges, and he called for similar treatment for illegally possessing a firearm.
In a Google Hangout online chat on Thursday, a participant asked Obama how renewing the assault weapons ban would help reduce gun violence caused primarily by handguns.
He responded that his proposed package would affect handgun violence through the expanded background checks and cracking down on straw purchases. Renewing the weapons ban focused on what Obama called "weapons of war."
"It's not going to solve every problem," the president continued, noting that some restrictions are already in place.
"We can't purchase a grenade launcher from a store, although there may be some folks who want to buy those," he said. "And the reason is we think on balance, the Second Amendment does not automatically assume that any weapon that's available you can automatically purchase."
-- CNN's Ashley Killough, Paul Steinhauser and Halimah Abdullah contributed to this report.