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Presidents occupy a unique role as both the head of the executive branch and a de facto party leader. They nationalize politics and polarize lawmaking. Members of Congress know this, and they leverage the president's symbolic power to heighten political conflict. I argue that lawmakers, particularly those in the nonpresidential party, invoke the president to nationalize legislative debate and polarize constituent opinion. Using the text of House and Senate floor speeches between 1973 and 2016 and a within‐member panel design, I find that legislators reference the president more frequently in the out‐party and increasingly so as a district's media environment becomes more nationalized. Presidential references are also moderated by constituency partisanship. I support the behavioral implications with a vignette experiment: when a Republican Senator invokes President Biden in a policy speech, Republican respondents increase approval of that Senator and oppose political compromise. This research highlights the institutional consequences of nationalization and negative partisanship. [ABSTRACT FROM AUTHOR]