Minneapolis live updates: ICE arrest powers expanded, memo says

The second fatal shooting this month of an American citizen in Minneapolis at the hands of a federal agent has ratcheted up tensions in the city once again -- and led to disputed accounts of what happened.

Alex Pretti, 37, an ICU nurse at a VA hospital who the Minneapolis police chief said was licensed to carry a concealed weapon, was fatally shot by a U.S. Customs and Border Protection agent on the morning of Jan. 24.

Local officials have disputed this characterization of events leading to Pretti's shooting and criticized federal officials, accusing them of rushing to "spin" the story. DHS Secretary Kristi Noem and Border Patrol Commander at Large Greg Bovino have claimed, without providing further evidence, that Pretti arrived at the scene "to inflict maximum damage on individuals." Noem told reporters that his actions amounted to "domestic terrorism." 

An unnamed witness provided more details in a federal court filing Saturday night about the shooting in Minneapolis of 37-year-old Alex Pretti.

The witness, whose name was redacted in court documents, said immigration agents pepper-sprayed three observers, including Pretti, before an agent shoved a woman to the ground.

"More agents came over and grabbed the man who was still trying to help the woman get up."

The witness said that agents pushed Pretti to the ground and added that "it didn't look like he was trying to resist, just trying to help the woman up."

"They threw him to the ground. Four or five agents had him on the ground and they just started shooting him," the witness said. "They shot him so many times."

The witness said they recorded a video that "accurately depicts the events leading up to the agents shooting him and several minutes afterwards."

The declaration was filed Saturday by the ACLU of Minnesota as part of an emergency motion to lift a stay on a federal judge's order that barred immigration agents from arresting protesters or using nonlethal weapons against them.

-ABC News' Laura Romero and Luke Barr

Senate Minority Leader Chuck Schumer said in a statement Saturday night that Democrats will block efforts to move forward with a package of funding bills if the bill that funds the Department of Homeland Security is included in the package.

"What’s happening in Minnesota is appalling —and unacceptable in any American city. Democrats sought common sense reforms in the Department of Homeland Security spending bill, but because of Republicans’ refusal to stand up to President Trump, the DHS bill is woefully inadequate to rein in the abuses of ICE. I will vote no," he said.

The Senate needs to pass a package of six government funding bills by Friday in order to avert a partial government shutdown. At least 60 votes are needed to tee up votes on any of the appropriations bills.

-ABC News' Allison Pecorin

Department of Homeland Security Kristi Noem called the shooting a "tragic situation" before arguing that the shots were "defensive" because that the agent was "fearing for his life." 

"This looks like a situation where an individual arrived at the scene to inflict maximum damage on individuals and to kill law enforcement," she said, echoing earlier characterizations by Border Patrol Commander at Large Greg Bovino.

Minnesota Gov. Tim Walz and Minneapolis Mayor Jacbo Frey have disputed those characterizations.

ABC News' Luke Barr asked  what evidence Noem had to make those claims that 37-year-old Alex Pretti wanted to injure or hurt law enforcement and, but she did not answer the question.

-ABC News's Emily Chang