The memo was dated Jan. 28 and signed by by Acting Director Todd Lyons.
A 37-year-old man was shot and killed Saturday morning in Minneapolis -- the second shooting of a U.S. citizen this month by federal agents in the city.
The shooting of Alex Pretti, an ICU nurse, ratcheted up tensions, as protesters clashed in the streets with law enforcement in the aftermath of the shooting.
The incident followed the fatal shooting of Renee Good, a 37-year-old mother, on Jan. 7.
A Department of Homeland Security report sent to Congress and obtained by ABC News says that two federal officers discharged their firearms during the shooting of Alex Pretti on Saturday in Minneapolis and does not say that Pretti attempted to reach for his weapon, based on a preliminary review of bodycam footage.
-ABC News' John Parkinson, Luke Barr, Jack Date and Jay O'Brien
Republican Sen. Thom Tillis told reporters Tuesday he does not think Homeland Security Secretary Kristi Noem should keep her job.
When asked by a reporter if he still had confidence in Noem after what's occurred in Minneapolis, he responded, "No, not at all. I think she should go."
Tillis is the first Senate Republican to say they believe Noem should no longer serve in her role.
This comes after Tillis on Sunday called for a "full and impartial" investigation into Alex Pretti's death in Minneapolis.
-ABC News' Allison Pecorin
President Donald Trump said in an interview with Fox News that the administration is “going to de-escalate a little bit” in Minneapolis.
However, he rejected the characterization that the change in plans was a "pullback," and spoke about Border Patrol Commander Greg Bovino.
"Bovino is very good, but he's a pretty out there kind of a guy. And in some cases, that’s good. Maybe it wasn't good here," he said, before claiming, without evidence, that the recent protests in Minnesota have been populated with "paid insurrectionists" and "paid agitators."
-ABC News' Nicholas Kerr, Isabella Murray and Meg Mistry
Senate Majority Leader John Thune called for a "full and impartial" investigation into the shooting of Alex Pretti, which he called a "tragedy," during a speech on the Senate floor Tuesday.
"I'm glad that the president is sending Tom Homan to Minnesota, and I hope that his arrival will restore order to the situation," Thune said.
As Democrats are threatening to derail all six government funding bills if a bill that funds DHS is not separated out from the larger package, Thune urged his colleagues to advance the full package, including the DHS bill.
Thune said he would "prefer" to keep all six appropriations bills moving as a package, but didn't rule out entirely stripping out the DHS bill.
Later, the senator appeared to break with Trump's suggestion that protestors should not bring guns to protests.
"One, it's a constitutional right. Two, it's legal under the laws of the state of Minnesota. Perhaps [Pretti] didn't have ID, but with that exception, he was in compliance with the laws. He has a constitutional right," he said.
Thune dodged questions about his confidence in DHS Secretary Kristi Noem.
-ABC News' Allison Pecorin and Lauren Peller
