In May, the State Department published a report saying it is "reasonable to assess" that Israel may have used American weapons in violation of international law. But it also said it could not definitively connect American weapons to specific cases.
"It is difficult to acquire that information in an active combat zone," Miller said. "But I would also say we didn't exactly work very hard to try to acquire the information."
U.S. law prohibits military assistance from being sent to countries that restrict the delivery of American aid, like food and medicine. Experts who track aid, including from multiple international organizations and the State Department itself, have found that Israel has continually blocked aid to the people of Gaza.
Brett McGurk, White House coordinator for the Middle East and one of President Biden's closest advisers, declined a 60 Minutes request for an interview. But a senior White House official told 60 Minutes that government lawyers have not determined that Israel has violated the laws of armed conflict, and therefore American weapons have continued to flow.
The official said Hamas could end the war by returning the estimated 95 hostages still in Gaza. Miller sees the war ending when Israel says it's over.
"Absent intervention from the United States or for someone else to compel or to force a decision, it ends when Netanyahu says it's over," he said.