Donald Trump says violent crime is on the rise, and a new study says he might be right

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Trump Promises to 'Restore Law and Order' in America

A new report published by the Major Cities Chiefs Association said that violent crime – homicides, rapes, robberies, assaults and shootings – is on the rise nationwide.

The troubling results, though just one survey, could provide vindication to Republican presidential candidate Donald Trump. President Barack Obama has contested Trump's assertionmade prominently in his nomination acceptance speech last week – that crime is a national epidemic and major problem.

The mid-year violent crime survey, released Monday, shows 307 more homicides so far in 2016, according to data compiled from 51 law enforcement agencies from some of America's largest cities, including Chicago, Los Angeles and New York. There have also been 1,000 more robberies, approximately 2,000 more aggravated assaults, and 600 more nonfatal shootings in 2016 compared to this time in 2015. The only type of of violent crime not showing an increase is rape.

SEE ALSO: Trump roasted all the DNC speakers, except for one

The 316 homicides reported by Chicago, the president's hometown, were the most concerning figure – a 48 percent increase from last year. Trump has pointed to Chicago's problems with homicide in the past, and noted the city's connection to the president during the RNC.

"In the president's hometown of Chicago, more than 2,000 people have been the victims of shootings this year alone. And almost 4,000 have been killed in the Chicago area since he took office," Trump told delegates Thursday in Cleveland.

RELATED: Violent crime rates in the United States

There are numerous theories behind the increase in crime, including the "Ferguson effect" – that police are more skittish to enforce laws for fear of backlash. New federal guidelines meant to cut down on police mistakes, and the end of such practices as "stop and frisk" in New York City are also possible reasons behind an increase in violent crime.

"Decades of progress made in bringing down crime are now being reversed by this administration's rollback of criminal enforcement," Trump said Thursday.

But crime was much higher in the 1970s, 80s and 90s, and was a major political issue, inspiring a bipartisan desire to get tough. Even then-Rep. Bernie Sanders voted for the now-controversial 1994 National Crime Bill. Scholars differ on why crime dropped, but major legislation, and different police tactics were employed at the same time as the decline. And some of those tactics, like stop and frisk, are now being rolled back.

See more of Trump's historic speech at the RNC:

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Donald Trump delivers speech at GOP convention RNC
U.S. Republican Presidential Nominee Donald Trump arrives onstage at the Republican National Convention in Cleveland, Ohio, U.S. July 21, 2016. REUTERS/Rick Wilking
U.S. Republican presidential nominee Donald Trump is greeted by Ivanka Trump after his introduction at the Republican National Convention in Cleveland, Ohio, U.S. July 21, 2016. REUTERS/Jim Young
Ivanka Trump, daughter of Republican Presidential Nominee Donald J. Trump, waves as she walks off stage after introduction her father during the final day of the Republican National Convention in Cleveland, Thursday, July 21, 2016. (AP Photo/J. Scott Applewhite)
CLEVELAND, OH - JULY 21: Republican presidential candidate Donald Trump gives two thumbs up to the crowd during the evening session on the fourth day of the Republican National Convention on July 21, 2016 at the Quicken Loans Arena in Cleveland, Ohio. Republican presidential candidate Donald Trump received the number of votes needed to secure the party's nomination. An estimated 50,000 people are expected in Cleveland, including hundreds of protesters and members of the media. The four-day Republican National Convention kicked off on July 18. (Photo by Joe Raedle/Getty Images)
CLEVELAND, OH - JULY 21: Republican presidential candidate Donald Trump acknowledges the crowd during the evening session on the fourth day of the Republican National Convention on July 21, 2016 at the Quicken Loans Arena in Cleveland, Ohio. Republican presidential candidate Donald Trump received the number of votes needed to secure the party's nomination. An estimated 50,000 people are expected in Cleveland, including hundreds of protesters and members of the media. The four-day Republican National Convention kicked off on July 18. (Photo by Joe Raedle/Getty Images)
CLEVELAND, OH - JULY 21: Republican presidential candidate Donald Trump delivers a speech during the evening session on the fourth day of the Republican National Convention on July 21, 2016 at the Quicken Loans Arena in Cleveland, Ohio. Republican presidential candidate Donald Trump received the number of votes needed to secure the party's nomination. An estimated 50,000 people are expected in Cleveland, including hundreds of protesters and members of the media. The four-day Republican National Convention kicked off on July 18. (Photo by Win McNamee/Getty Images)
Donald Trump, 2016 Republican presidential nominee, speaks during the Republican National Convention (RNC) in Cleveland, Ohio, U.S., on Thursday, July 21, 2016. This evening marks the last night of a four-day Republican National Convention that has been defined by disorderly floor activity, divisions within the party, a plagiarized speech delivered by the nominee's wife and scattered protests in the streets of Cleveland. Photographer: David Paul Morris/Bloomberg via Getty Images
CLEVELAND, OH - JULY 21: Republican presidential candidate Donald Trump preapres to deliver his speech during the evening session on the fourth day of the Republican National Convention on July 21, 2016 at the Quicken Loans Arena in Cleveland, Ohio. Republican presidential candidate Donald Trump received the number of votes needed to secure the party's nomination. An estimated 50,000 people are expected in Cleveland, including hundreds of protesters and members of the media. The four-day Republican National Convention kicked off on July 18. (Photo by Win McNamee/Getty Images)
US Republican presidential candidate Donald Trump speaks on the last day of the Republican National Convention on July 21, 2016, in Cleveland, Ohio. / AFP / Jim WATSON (Photo credit should read JIM WATSON/AFP/Getty Images)
Republican presidential candidate Donald Trump speaks on the last day of the Republican National Convention on July 21, 2016, in Cleveland, Ohio. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)
U.S. Republican Presidential Nominee Donald Trump speaks at the Republican National Convention in Cleveland, Ohio, U.S. July 21, 2016. REUTERS/Rick Wilking
The mouth of US Republican presidential candidate Donald Trump is seen on a big screen as he speaks on the last day of the Republican National Convention on July 21, 2016, in Cleveland, Ohio. / AFP / Jim WATSON (Photo credit should read JIM WATSON/AFP/Getty Images)
CLEVELAND, OH - JULY 21: Republican presidential candidate Donald Trump delivers a speech during the evening session on the fourth day of the Republican National Convention on July 21, 2016 at the Quicken Loans Arena in Cleveland, Ohio. Republican presidential candidate Donald Trump received the number of votes needed to secure the party's nomination. An estimated 50,000 people are expected in Cleveland, including hundreds of protesters and members of the media. The four-day Republican National Convention kicked off on July 18. (Photo by John Moore/Getty Images)
US Republican presidential candidate Donald Trump speaks on the last day of the Republican National Convention on July 21, 2016, in Cleveland, Ohio. / AFP / JIM WATSON (Photo credit should read JIM WATSON/AFP/Getty Images)
A CODEPINK protester is removed while US Republican presidential candidate Donald Trump speaks on the last day of the Republican National Convention on July 21, 2016, in Cleveland, Ohio. / AFP / JIM WATSON (Photo credit should read JIM WATSON/AFP/Getty Images)
CLEVELAND, OH - JULY 21: Republican presidential candidate Donald Trump delivers a speech during the evening session on the fourth day of the Republican National Convention on July 21, 2016 at the Quicken Loans Arena in Cleveland, Ohio. Republican presidential candidate Donald Trump received the number of votes needed to secure the party's nomination. An estimated 50,000 people are expected in Cleveland, including hundreds of protesters and members of the media. The four-day Republican National Convention kicked off on July 18. (Photo by Alex Wong/Getty Images)
Delegates listen as Republican presidential candidate Donald Trump addresses the final night of the Republican National Convention at Quicken Loans Arena in Cleveland, Ohio, July 21, 2016. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)
Republican U.S. presidential nominee Donald Trump formally accepts the nomination at the Republican National Convention in Cleveland, Ohio, U.S. July 21, 2016. REUTERS/Carlo Allegri
Republican U.S. presidential nominee Donald Trump formally accepts the nomination at the Republican National Convention in Cleveland, Ohio, U.S. July 21, 2016. REUTERS/Carlo Allegri
CLEVELAND, OH - JULY 21: Attendees listen to Republican presidential candidate Donald Trump deliver his speech on the fourth day of the Republican National Convention on July 21, 2016 at the Quicken Loans Arena in Cleveland, Ohio. Republican presidential candidate Donald Trump received the number of votes needed to secure the party's nomination. An estimated 50,000 people are expected in Cleveland, including hundreds of protesters and members of the media. The four-day Republican National Convention kicked off on July 18. (Photo by Jeff Swensen/Getty Images)
CLEVELAND, OH - JULY 21: Deligates stand and cheer as Republican presidential candidate Donald Trump delivers his speech on the fourth day of the Republican National Convention on July 21, 2016 at the Quicken Loans Arena in Cleveland, Ohio. Republican presidential candidate Donald Trump received the number of votes needed to secure the party's nomination. An estimated 50,000 people are expected in Cleveland, including hundreds of protesters and members of the media. The four-day Republican National Convention kicked off on July 18. (Photo by Win McNamee/Getty Images)
CLEVELAND, OH - JULY 21: An attendee stands and cheers as Republican presidential candidate Donald Trump delivers his speech on the fourth day of the Republican National Convention on July 21, 2016 at the Quicken Loans Arena in Cleveland, Ohio. Republican presidential candidate Donald Trump received the number of votes needed to secure the party's nomination. An estimated 50,000 people are expected in Cleveland, including hundreds of protesters and members of the media. The four-day Republican National Convention kicked off on July 18. (Photo by Chip Somodevilla/Getty Images)
Rudy Giuliani, right, former mayor of New York City, applauds as Republican Presidential Nominee Donald Trump addressed the audience during the final day of the 2016 Republican National Convention at Quicken Loans Arena in Cleveland, Ohio, July 21, 2016. (Photo by Brian van der Brug/Los Angeles Times via Getty Images)
CLEVELAND, OH - JULY 21: (L-R) Tiffany Trump, Barron Trump and Melania Trump listen to Republican presidential candidate Donald Trump deliver his speech on the fourth day of the Republican National Convention on July 21, 2016 at the Quicken Loans Arena in Cleveland, Ohio. Republican presidential candidate Donald Trump received the number of votes needed to secure the party's nomination. An estimated 50,000 people are expected in Cleveland, including hundreds of protesters and members of the media. The four-day Republican National Convention kicked off on July 18. (Photo by Jeff Swensen/Getty Images)
CLEVELAND, OH - JULY 21: Republican presidential candidate Donald Trump and his family acknowledge the crowd on the fourth day of the Republican National Convention on July 21, 2016 at the Quicken Loans Arena in Cleveland, Ohio. Republican presidential candidate Donald Trump received the number of votes needed to secure the party's nomination. An estimated 50,000 people are expected in Cleveland, including hundreds of protesters and members of the media. The four-day Republican National Convention kicked off on July 18. (Photo by Jeff Swensen/Getty Images)
US Republican presidential candidate Donald Trump (C L) and vice presidential candidate Mike Pence (C R) are joined by their families at the end of the Republican National Convention on July 21, 2016, in Cleveland, Ohio. / AFP / JIM WATSON (Photo credit should read JIM WATSON/AFP/Getty Images)
Republican presidential candidate Donald Trump embraces his wife Melania on the final night of the Republican National Convention at the Quicken Loans Arena in Cleveland, Ohio on July 21, 2016. / AFP / Jim WATSON (Photo credit should read JIM WATSON/AFP/Getty Images)
CLEVELAND, OH - JULY 21: Republican presidential candidate Donald Trump and Republican vice presidential candidate Mike Pence stand with their families on the fourth day of the Republican National Convention on July 21, 2016 at the Quicken Loans Arena in Cleveland, Ohio. Republican presidential candidate Donald Trump received the number of votes needed to secure the party's nomination. An estimated 50,000 people are expected in Cleveland, including hundreds of protesters and members of the media. The four-day Republican National Convention kicked off on July 18. (Photo by Chip Somodevilla/Getty Images)
Balloons descend on the delegates as the families of Republican presidential candidate Donald Trump and his nominee for vice-president Mike Pence appear on stage at the end of the last day of the Republican National Convention on July 21, 2016, in Cleveland, Ohio. / AFP / DOMINICK REUTER (Photo credit should read DOMINICK REUTER/AFP/Getty Images)
CLEVELAND, OH - JULY 21: Republican presidential candidate Donald Trump embraces Republican vice presidential candidate Mike Pence after his speech on the fourth day of the Republican National Convention on July 21, 2016 at the Quicken Loans Arena in Cleveland, Ohio. Republican presidential candidate Donald Trump received the number of votes needed to secure the party's nomination. An estimated 50,000 people are expected in Cleveland, including hundreds of protesters and members of the media. The four-day Republican National Convention kicked off on July 18. (Photo by Jeff J Mitchell/Getty Images)
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Trump and his allies, such as former New York City Mayor Rudy Guiliani, argue that the rollback in enforcement is a mistake and that the Obama administration and Democrats are demonizing police. Obama has conceded a mild spike in crime, but contested the idea that it's a major concern.

"This idea that America is somehow on the verge of collapse, this vision of violence and chaos everywhere, doesn't really jibe with the experience of most people," Obama said Friday.

"Although it is true that we've seen an uptick in murders and violent crime in some cities this year, the fact of the matter is that the murder rate today, the violence rate today is far lower than it was when Ronald Reagan was president and lower than when I took office," Obama said.

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