Trump, joined by Attorney General William Barr, unveiled an expansion of the "Operation Legend" program to include cities such as Chicago and Albuquerque, New Mexico, in a further effort by federal officials to tackle violence.
"Today I'm announcing a surge of federal law enforcement into American communities plagued by violent crime," said Trump.
Trump said "we have no choice but to get involved" with a rising death toll in some major cities.
"This bloodshed must end, this bloodshed will end," he said.
The program involves deploying federal law enforcement agents to assist local police in combating what the Justice Department has described as a "surge" of violent crime.
A Justice Department official said the initiative is not related to the use of federal agents from the Department of Homeland Security to quell unrest in Portland, Oregon.
The Republican president has sharply criticized Democratic leaders for presiding over cities and states that are experiencing crime waves, using the issue as part of a "law and order" push he hopes will resonate with his political base. Trump is trailing Democrat Joe Biden in national opinion polls.
It is not unusual for federal law enforcement to work alongside local partners. The Justice Department official said "Operation Legend" would provide additional resources to cities suffering from "traditional" violent crime.
Trump has emphasized a robust policing and military approach to the protests across the United States about racial inequality after the death of George Floyd, a Black man, in Minneapolis police custody.
The White House has sought to focus on city crime even as Trump's approval numbers plummet in response to his handling of the coronavirus pandemic.
The "Operation Legend" program involves federal agents form the FBI, U.S. Marshals Service and other agencies, partnering with local law enforcement.
New York Governor Andrew Cuomo has said federal intervention was not required to help with violence in New York City, and Chicago Mayor Lori Lightfoot has also urged Trump not to send unidentified federal agents to her city.
"Operation Legend" is named for LeGend Taliferro, a 4-year-old boy who was shot and killed while he slept early June 29 in Kansas City, Missouri, according to the Department of Justice's website.
DONALD TRUMP: Every American, no matter their income, their race, or their zip code should be able to walk their city streets free from violence and free from fear. For this reason, today, I am announcing that the Department of Justice will immediately surge federal law enforcement to the city of Chicago. The FBI, ATF, DEA, US Marshals Service, and Homeland Security will together be sending hundreds of skilled law-enforcement officers to Chicago to help drive down violent crime.
And murderers and violent criminals are breaking a wide range of federal laws. We have that. It's as wide as it can be. We will find them, arrest them, and prosecute them. They will be in jail for many years to come. And we will work with local police to identify violations of state and local laws to help ensure that offenders are caught and jailed for their crimes.
But we must remember that the job of policing a neighborhood falls on the shoulders of local elected leadership. Never forget that. When they abdicate their duty, the results are catastrophic Americans must hold their city leaders accountable. They must insist that community officials fully support, fully back, and fully fund their local police departments. There is simply no substitute for a police department that has the strong backing of city leaders.
In the meantime, we will use federal law enforcement to [INAUDIBLE] charge federal crimes and support these besieged communities to the greatest extent possible. This will be hard, painstaking work. It will take time. The tide will not recede overnight. But we will marshal all of the strength, and focus, and determination that we can possibly do. This is a critical effort.
We will continue to call on state and local leaders to do their job and protect their citizens. The operation in Chicago will be done as part of Operation Legend, which was recently launched in Kansas City, Missouri-- and very successfully, I might add. It is named after a Legend Taliaferro, a four-year-old boy who's shot-- think of this-- who was shot and killed last month while he lay asleep in his home. Legend's mother grieves. Our hearts, and pains, and souls-- and we thank you very much for being here. Thank you very much. Thank you very much. Appreciate it.