Democratic foreign policy choices are a function of expected international outcomes and the preferences, power, and information of domestic actors. Studies of domestic political competition and international crisis bargaining have argued that an opposition's policy positions send credible signals of the government's intentions to adversarial target states. This paper contends that while opposition behavior may send informative signals, it can also directly constrain the policy options of the government. We relax previous assumptions that the opposition cannot directly prevent war or influence the outcomes of war (Schultz 2001). Instead, we assume that the opposition controls some political resources and attempts to influence the government's policy decisions in a way that advances its own partisan interests. To empirically demonstrate the theoretical differences in our model in comparison with previous domestic opposition models, we examine the case of the Quasi-War of 1798 between the United States and France.Among the leading trends in the study of international conflict during the last two decades is the rapidly growing interest in the domestic sources of state foreign policies and international outcomes. This interest has led to major research projects on the democratic peace, the diversionary theory of war, the influence of domestic economic and ethnic groups, the impact of societal culture and ideology, and the role of public opinion. One important and influential line of research focuses on the role of domestic political oppositions in international crises and war, with particular attention to the strategic interaction among governments, oppositions, and external adversaries. Beginning with Schultz (1998Schultz ( , 2001, this domestic opposition research found that opposition behavior can signal the resolve of the government. This helps democracies demonstrate the credibility of their threats during crises.Although standard signaling models of opposition behavior have contributed significantly to our understanding of democratic crisis behavior, they underestimate the constraining effect that domestic opposition can have on a government. Among other things, they neglect the fact that oppositions possess political resources that can help deter the government from initiating conflict or force the government to back down after a threat has been challenged. They also neglect the lasting political consequences of rally effects. Incorporating these assumptions leads to different theoretical predictions than do the standard opposition signaling models.The paper is structured as follows. We begin with a review of the domestic opposition literature. Next, we justify our assumptions that in many political systems the opposition controls adequate resources to warrant an attempt to block war or to interfere with the successful conduct of the war, and rally effects can have lasting political consequences. We then construct a formal model of the strategic interaction of governments, oppositions, and adversaries. The mode...