Senator Bernie Sanders has sparked a strong grassroots response in his run for the Democratic presidential nomination on social and economic issues. At the same time, he has given short shrift to foreign policy, military spending and war. That approach should change.

I’m among millions of supporters who are enthusiastic about the clarity of his positions in taking on Wall Street, corporate power and economic inequality. But we also need Sanders to be clear about what he would do as commander in chief of the world’s leading military power.

A snapshot of avoidance can be found on the Sanders campaign’s official website. Under the headline “On the Issues,” Sanders makes no mention of foreign policy, war or any other military topic. The same omissions were on display at an Iowa Democratic Party annual dinner on July 17, when Sanders gave a compelling speech but made no reference to foreign affairs. Hearing him talk, you wouldn’t have a clue that the United States is in its 14th year of continuous warfare. Nor would you have the foggiest inkling that a vast military budget is badly limiting options for the expanded public investment in college education, infrastructure, clean energy and jobs that Sanders is advocating.

Such omissions have become typical of Sanders’ campaign. After hearing the candidate address a rally with 8,000 people in Portland, Maine, in early July, longtime activist Bruce Gagnon was glum. An Air Force veteran who coordinates a group opposing weapons in space, Gagnon wrote: “Nothing was said about the metastasizing Pentagon budget nor a mumbling word was spoken about foreign policy.”

Perhaps Sanders prefers to bypass such issues because addressing them in any depth might split his growing base of supporters, who have been drawn to his fervent economic populism. But ongoing war and huge military spending continue to be deeply enmeshed with ills of the domestic U.S. economy and many dire social problems. About 54 percent of the U.S. government’s discretionary spending now goes to military purposes, hemming in more productive expenditures.

While unavailable on his campaign website and barely mentioned on the stump, the broad outlines of Sanders’ opinions about foreign policy and war can be gleaned from interviews and Q&A portions of town hall appearances. For the most part, on those subjects, his outlook appears to be in line with the views of many Democrats on Capitol Hill.

After a question about “the military establishment” and “perpetual war” from a man who identified himself as a veteran for peace at a recent town hall gathering in Iowa City, Sanders’ reply was tepid Democratic boilerplate. He blamed Republican hawks for getting the U.S. into Iraq. He called for progress against waste and cost overruns at the Pentagon. And he said that in the war against the Islamic State of Iraq and the Levant (ISIL), the U.S. government should act jointly with regional allies such as Saudi Arabia and Turkey. (“Those countries are going to have to get their hands dirty, it cannot just be the United States alone.”)

When pressed for details on military intervention, Sanders has indicated that his differences with the Barack Obama administration are quite minor. Like many Democrats, he supports U.S. air strikes in the Middle East, while asserting that only countries in the region should deploy ground forces there. Sanders shares the widespread view among members of Congress who don’t want boots on the ground but do want U.S. air power to keep dropping bombs and firing missiles.