Offering their “advice in a spirit of friendship” in an open letter issued on Wednesday, over 100 noted intellectuals, left-wing academics, and progressive activists have urged Sen. Bernie Sanders (I-Vt.) to lay out clear proposals for a foreign policy that rejects U.S. militarism, overseas misadventures, and the outrageous Pentagon budget that continues to cripple funding for many of the progressive programs and policy solutions the senator advocates.

Given the $1 trillion annually in so-called “national security spending” as well as the military industrial complex’s impact on the environment and “the erosion of liberties,” Sanders’s public comments and policy proposals should address head-on the military and its spending, the group writes in the open letter.