This NYT article [1] has some quotes from Sen. Duckworth that outlines the problem as she sees it.

One in particular: "People don’t even know that we are deporting veterans. I think most Americans assume that when somebody serves, they gain American citizenship. They don’t realize that we are actually deporting people who served honorably."

[1] https://www.nytimes.com/2021/07/07/us/politics/veterans-depo...