This article is part of TPM Cafe, TPM’s home for opinion and news analysis. It was originally published at The Conversation.

On the campaign trail, former President Donald Trump has declared there are serious threats to the United States. First, he said, there is “the outside enemy, and then we have the enemy from within, and the enemy from within, in my opinion, is more dangerous,” as he told Fox News in an Oct. 13, 2024, interview.

He went on to say that “the bigger problem are the people from within. We have some very bad people. We have some sick people, radical left lunatics. And I think. And it should be very easily handled by, if necessary, by National Guard or, if really necessary, by the military.” https://www.youtube.com/embed/9DauQjmpqZM?wmode=transparent&start=8 Donald Trump discusses ‘the enemy within’ the United States.

When asked on CNN about Trump’s remarks about using the military on U.S. soil, Mark Esper, one of five people who led the Defense Department during Trump’s presidency, said Americans “should take those words seriously,” most especially because Trump had already tried to do so when he was president.

As professors of military ethics, we worry that Trump’s actions while president, and his comments about his plans for a potential second term, may put the military in a tough position. The July 1, 2024, Supreme Court ruling giving the president immunity for official acts – potentially including as commander in chief of the military – would make that tough position even more difficult. https://www.youtube.com/embed/Kmmx1zQCQds?wmode=transparent&start=538 Donald Trump says armed forces should take on ‘the enemy from within’ the U.S.

In the summer of 2020, protests, including some violent ones, arose in cities around the U.S. in the wake of the May 25 murder of George Floyd. Then-President Trump announced he was considering sending the U.S. military into the streets of several American cities. He had already deployed some National Guard members in Washington in an effort to control the demonstrations there.

At the time, the two of us considered the possibility of dissent within the military hierarchy, saying that resistance........

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