Christianson said his department was prohibited by the law from sharing the suspect's gang affiliations, "other active warrants" and past drunken driving arrests with federal immigration authorities.
Singh was found shot by other officers and taken to a hospital, where he was pronounced dead, police said.
Arriaga came to the United States illegally and was believed to have been fleeing to Mexico, Christianson said.
"We don't have the resources to make this happen and with a blink of an eye they came to our aid and were able to catch the suspect and bring him to our custody".
He said they were trying to protect Arriaga, who was trying to go to Mexico.
The sheriff whose agency was leading the investigation blamed California's sanctuary law for preventing local authorities from reporting Perez Arriaga to federal immigration officials for previous arrests.
The brother of Singh spoke during a press conference after the tragedy, during which he shared his thankfulness for the law enforcement's capture and sorrow for his loss. Singh had a newborn son and joined the 12-officer Newman police force in 2011.
The immigration fight has intensified as Trump pushes for funding for a border wall that congressional Democrats oppose, forcing a partial government shutdown.
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He died late Christmas Eve at a New Mexico hospital after suffering coughing, vomiting and a fever, according to law enforcement. The Washington Post reported that Caal died of dehydration.
Trump tweeted about the shooting on Thursday, days after the December 22 partial shutdown of the federal government.
A photo taken that day shows Singh and his K-9 in uniform along with his wife and baby and his K-9 posing in front of a Christmas tree.
Officer Ronil Singh, 33, pulled over the suspect just before 1 a.m. Wednesday and a few moments later called out "shot fired" over the radio.
A resident who saw the driver get behind the wheel flagged down Singh and heard the gunshots minutes later, Stanislaus County sheriff's Sgt. Tom Letras told the Modesto Bee newspaper.
When a gunfight broke out, Singh tried to defend himself but apparently did not hit the suspect, Christianson said.
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A computer virus hit newspaper printing plants in Chicago, Los Angeles, and at Tribune Publishing newspapers across the country. The technology housed at the Los Angeles Times has been able to make some major strides in fixing the problem as it now stands.
"Officer Singh sacrificed everything".
"Because I want the nation to know, I want your viewers to know, that Officer Singh really should be the focus of this investigation and his sacrifice". "We need closure, his family needs closure".
As Fox News reported, Gustavo Perez Arriaga is accused in the shooting death of Newman Police Cpl. Jerry Brown says the law permits sharing information on unsafe gang members with federal authorities. They were also in the USA illegally. If armed officers are rendered vulnerable or impotent, what does that say for the rest of us?
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Live Nation Las Vegas president Kurt Melien went onto reveal how the hype surrounding residencies is a generally new phenomenon. After the 2018 year-end shows, the residency is spread out through 2019, from January until the beginning of November.
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