President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE on Friday complained about the mayor of San Diego tipping off residents about a planned Immigration and Customs Enforcement (ICE) operation, when it was actually the mayor of Oakland who issued the warning.

Trump made the comments while speaking at Angel Families, an event for people who have lost family members to crimes committed by people in the country illegally.

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"Where is the condemnation of the Democrats’ sanctuary cities that release violent criminals into our communities and then protect them like the mayor of San Diego, when she warned everybody that ICE is coming and they scattered," Trump said.

Trump calls for a federal investigation into the mayor of San Diego for tipping off an ICE raid. (I believe he meant the mayor of Oakland!) pic.twitter.com/DxwY4DdI01 — Aaron Rupar (@atrupar) June 22, 2018

Trump added that he has been calling for the mayor to be investigated for weeks.

Trump seemed to be referencing Oakland Mayor Libby Schaaf (D), who, earlier this year, warned the city's immigrant residents about upcoming ICE raids. ICE claimed that Schaaf's warning precluded the agency from detaining about 800 immigrants considered to be "public safety threats."

Trump, in April, said Schaaf was guilty of obstruction of justice.

"How about the mayor of Oakland, where she tells a thousand people to 'get going, law enforcement's coming to get you.' And this was all planned. And many of them scattered," Trump said.

"To me that's obstruction of justice, and something should happen there. And it hasn't and I don't know why it hasn't."

Schaaf has previously said she does not regret alerting immigrant residents and instructing them to "prepare, not panic" ahead of the raid.

Trump's comments come amid a week of intense bipartisan scrutiny faced by his administration for its "zero tolerance" immigration policy.

The policy, announced in April, seeks to expedite the prosecution of migrants who cross into the U.S. illegally via the southern border. The practice, initially labeled a deterrence measure by Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsGOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status MORE and other Trump administration officials, drew widespread condemnation for resulting in the separation of thousands of migrant children from their families.

Trump, bowing to intensifying pressure from both sides of the aisle to stop such separations, signed an executive order on Wednesday to halt the practice. The order did not offer details on the futures of children already separated from their parents, but The Associated Press reported Friday that, of the more than 2,000 children who were separated, nearly 500 have been returned to their families.

The president continues to call for increased border security and has vowed to keep in place his zero tolerance policy. Under the policy, the government can only detain families together for "up to 20 days" while adults await court dates.