They also shouted chants such as "Lock him up" and "Trump must go".
"More than anyone else he should be here, because maybe he could maybe learn something", Mr Trump said, claiming Mr Johnson puts the needs of illegal immigrants above the needs of the law-abiding residents of Chicago. "Because my parents came to the United States of America to live the American dream".
The president is technically right: Federal Bureau of Investigation stats show overall violent crime in Chicago is down eight percent, not 10 percent. Police Supt. Eddie Johnson said the department did an exhaustive search to try to identify the person and couldn't.
After arriving at McCormick place Monday morning for a 66-minute speech, addressing crime during the International Association of Chiefs of Police convention, Trump wasted no time boasting about the killing of ISIS leader Abu Bakr al-Baghdadi over the weekend.
"At the time of the charges against Smollett, Trump tweeted: ".@JussieSmollett - what about MAGA and the tens of millions of people you insulted with your racist and unsafe comments!? In remarks at the same conference a year earlier, in Orlando, Fla., he suggested the city implement the legally dubious practice of "stop and frisk" to cut down on crime.
"The most risky and shameful attacks on the rule of law comes from and in the form of sanctuary cities", Trump said.
We at The Daily Eastern News think the president should not criticize Johnson so brazenly because Chicago is such a big city that trying to reduce the crime is not as simple as snapping your fingers.
Trump last visited Chicago in 2016 as a presidential candidate for what supposed to be a campaign rally on the campus of the University of IL at Chicago.
Joshua Carmona said he supports the president's policies on immigration and taxation.
Ballpark boos a rarity for shielded president
When the boos began as Trump's image flashed on the ballpark's giant video screen, the president seemed momentarily taken aback. Clinton would nearly certainly be impacted by President Trump's successes against the Islamic State, as she was the U.S.
"And you're going to see tremendous results very quickly", Trump added.
Five people were arrested at the 2016 rally, and four people were injured - including two police officers, CBS Chicago says.
Yet the city is also home to Trump International Hotel and Tower downtown, where the president had a high-end fundraiser Monday.
Homicides in Chicago in 2018 numbered 561, down from 653 in 2017.
President Trump returned to Washington Monday afternoon. There have been 436 people killed in the city in 2019 as of Sunday, 46 fewer than at the same point the previous year, according to data compiled by the Chicago Tribune.
The U.S. Attorney's Office in Chicago reports a 44% increase in the number of defendants it has charged with gun-related offenses in 2019 compared with last year, a 15-year high for new prosecutions.
Trump's address featured all of the fascistic themes he has incorporated into his campaign speeches in advance of the 2020 presidential election: attacks on the media, denunciations of "activist judges" who strike down his unconstitutional executive orders, the branding of undocumented immigrants as criminals and rapists, boasts about building the border wall, praise for the gun lobby, and attacks on "far-left activists" and "radical politicians".
On their Facebook page, the chapter posted that "such a gesture would be an insult to both President Trump and the office of the presidency itself and would be a mark of disgrace upon the city throughout the entire nation, including Mayor Lori Lightfoot".
"And that's the superintendent of Chicago police Eddie Johnson". Who would he use as his punchline and punching bag? Johnson blamed the episode on a change in his blood pressure medication.