'It can't be a great city if people are shot walking down the street for a loaf of bread.'
On Tuesday, the president threatened to 'send in the Feds' if the Illinois State Government didn't dramatically reduce the problem.
While many have slammed Trump's anti-Muslim immigration policies as inflammatory, he said there was no way for him to contribute to the animosity surrounding the issue because it is already as heated 'as it gets'.
'The world is a mess. The world is as angry as it gets. What? You think this is gonna cause a little more anger? The world is an angry place.'
He defended plans to keep put a ban on refugees and Syrian immigrants entering the country, explaining that he wants to prevent another 9/11.
Trump is expected to announce a new refugee policy that replaced a proposed ban on Muslim immigrants any day now.
A draft of the executive order that was leaked to the press Wednesday calls for an indefinite halt to admission for Syrian refugees, and a four-month ban for all others.
The Trump administration is also considering a 30-day suspension, at least, of visas for anyone from Iran, Iraq, Libya, Somalia, Sudan, Syria or Yemen, according to Reuters.
While not explicitly aimed at keeping immigrants out who are followers of Islam, the policies would have that effect. The countries affected by the new regulations are majority-Muslim.
Syrians would be offered protection within a 'safe zone' inside their country - an idea that was considered by the previous administration and discarded because of the resources it would take to enforce it.
'People that come in, in many cases, in some cases with evil intentions. I don't want that. They're ISIS. They're coming under false pretense. I don't want that.
'We're going to have extreme vetting in all cases. And I mean extreme. And we're not letting people in if we think there's even a little chance of some problem.
'We are excluding certain countries. But for other countries we're gonna have extreme vetting. It's going to be very hard to come in.
'Right now it's very easy to come in. It's gonna be very, very hard. I don't want terror in this country. You look at what happened in San Bernardino. You look at what happened all over. You look at what happened in the World Trade Center.'
To prevent terror, he said he was open to waterboarding and had been told in no uncertain terms that 'torture works'.
He also claimed that had the US 'kept' Iraq oil after the war ISIS would never have been created.
'We should've kept the oil when we got out. And, you know, it's very interesting, had we taken the oil, you wouldn't have ISIS because they fuel themselves with the oil.'
The wall on the Mexican border will go up, he said, and would be paid for by Mexico eventually if not straight away.
'All it is, is we'll be reimbursed at a later date from whatever transaction we make from Mexico.
'I'm just telling you there will be a payment. It will be in a form, perhaps a complicated form. What I'm doing is good for the United States.
'It's also going to be good for Mexico. I wanna start the wall immediately.'