My research broadly addresses three areas:

a) US politics

• Executive-legislative relations
• Foreign and security policies
• Ideological polarization

b) Foreign Policy Analysis

• Legislatures and their impact on foreign and security policies
• Parties and societal contestation of international politics
• Policy areas: military interventions, arms control, defense budgets, relations towards Russia

c) Transatlantic relations

• US-European relations
• NATO
• German foreign and security policy
• Trust & mistrust among allies