The US is planning to "draw down" federal forces in Minneapolis after the fatal shootings of two US citizens there, but it is not ending its immigration operation, Tom Homan, the White House's border tsar said on Thursday .

"The draw down is going to happen," Homan said at a press conference in Minneapolis, but added: "We are not surrendering our mission at all. We're just doing it smarter."

It was not clear how many federal forces might leave the city, or when, raising new questions about how far the Trump administration will scale back its operation after the president said he was seeking to "de-escalate" in Minneapolis.

"President Trump wants this fixed, and I'm going to fix it," Homan said.

The killings of Renee Good and Alex Pretti by agents carrying out Trump's immigration crackdown this month have provoked protests in Minneapolis, public outcry across the US and calls from lawmakers in both parties for some administration officials to be removed.