Steinle, a medical equipment saleswoman, was out for a July afternoon walk with her dad on San Francisco's Pier 14 when she was struck in the back by a single bullet.
Trump frequently highlighted Steinle's case on the campaign trail, including in his speech at the Republican National Convention last summer when he accepted the party's presidential nomination.
A jury on Thursday found a Mexican man not guilty in the killing of a woman on a San Francisco pier that touched off a national immigration debate two years ago, rejecting possible charges ranging from involuntary manslaughter to first-degree murder.
Prosecutor Diana Garcia had argued the shooting was a deliberate act, while defense attorneys Matt Gonzalez and Francisco Ugarte described it as an accident, occurring after Garcia Zarate picked up a gun he found on the pier.
The semi-automatic handgun used to kill Steinle was stolen from a federal Bureau of Land Management ranger a week before the shooting.
"Today is vindication for the rights of immigrants", defense attorney Francisco Ugarte said.
"For Donald Trump, we were just what he needed-beautiful girl, San Francisco, illegal immigrant, arrested a million times, a violent crime and yadda, yadda, yadda", Steinle's mother, Liz Sullivan, told the San Francisco Chronicle months after her daughter's death. "San Francisco's decision to protect criminal aliens led to the preventable and heartbreaking death of Kate Steinle".
Search underway for missing 3-year-old Onslow County girl
Mariah Kay Woods was last seen at her home in Jacksonville, N.C., after her mother, Kristy Woods, put her to bed on Sunday night. Wrongdoing Stoppers in Onslow County is putting forth a $2,500 remunerate for data that prompts finding the little child.
The defendant had been deported five times.He was scheduled for a sixth deportation in 2015 while he was in federal custody for felony reentry.
While the jurors didn't hear evidence regarding Zarate's immigration status, the shooting came roughly three months after a San Francisco jail released him despite federal immigration authorities' request he remain detained before his deportation.
But he told jurors that Garcia Zarate had no motivation to kill Steinle and that as terrible as her death was, "nothing you do is going to fix that". Under local sanctuary city rules, local law enforcement won't hold a person beyond the term of their incarceration.
U.S. Attorney General Jeff Sessions says he hopes local officials will "consider carefully the harm they are doing to their citizens" by not cooperating with federal immigration officials.
Defense attorneys have told jurors that Garcia Zarate lived on the streets of San Francisco after being released from jail, scraping together a living by collecting recyclables and scavenging for food. When he was released, ICE sent him to San Francisco on March 26, 2015, for a 1995 warrant accusing him of selling $20 worth of marijuana.
He had been deported five times before.
But he told jurors that Garcia Zarate had no motivation to kill Steinle and as bad as her death was, "nothing you do is going to fix that".