There is no publicly available, independently verified evidence confirming Stephen Miller's specific claim that 150,000 'criminal illegal aliens' have been deported or that 'millions and millions more' remain to be deported.
Stephen Miller claims 150,000 "criminal illegal aliens" have been deported so far, but there are "millions and millions more to go."

FactVerify
Source: factverify.com
Key Evidence
No official government data or credible independent sources were found confirming the exact figure of 150,000 criminal illegal alien deportations attributed to Miller. Estimates of undocumented immigrants do not support the claim of 'millions and millions' remaining as criminals.
What the Evidence Shows
The input contains two core factual assertions attributed to Stephen Miller: first, that 150,000 'criminal illegal aliens' have been deported so far; second, that there are 'millions and millions more to go. ' The search results and available sources do not provide direct verification or official data supporting these exact figures. While Stephen Miller is a known immigration hardliner and has made various claims about immigration enforcement, none of the provided sources confirm these specific numbers.
Official U.S. Government immigration enforcement statistics from agencies like ICE or DHS would be necessary to verify the number of deportations of individuals classified as 'criminal illegal aliens. ' Furthermore, the claim that 'millions and millions more' remain is vague and lacks a clear definition or source. Estimates of the undocumented immigrant population in the U.S. Vary but generally range in the low millions, and not all are classified as criminals.
Without precise definitions or official data, this part of the claim cannot be substantiated. Given the absence of direct evidence or authoritative confirmation in the search results, this claim remains unverifiable. It is important to note that political figures often use rounded or exaggerated figures for rhetorical effect, which complicates factual verification.