Nicaragua, a longstanding supporter of the Palestinian cause, is broadening the legal battle over the Gaza conflict at the International Court of Justice by bringing a case against Germany, a major supplier of arms to Israel.

Nicaragua is arguing in its filing that “Germany is facilitating the commission of genocide” in Gaza and violating the Genocide Convention by providing Israel with military and financial aid. It asks for emergency measures ordering Berlin to halt its wartime support to Israel.

In hearings opening on Monday at the court in The Hague, Nicaragua is also expected to assert that Germany is enabling grave breaches of the Geneva Conventions by Israel, in particular the obligation to protect civilians during armed conflict.

A spokeswoman for the German chancellery, Christine Hoffman, told journalists last week that the government rejects Nicaragua’s accusations. Germany is expected to respond to the case on Tuesday morning.

The case brought by Nicaragua raises new questions about the liability of countries that have supplied weapons to Israel for the war in Gaza.

Lawyers say that Germany — Israel’s second-largest arms provider, after the United States — is an easier target for a suit than is the United States. Germany has granted full jurisdiction to the International Court of Justice, the United Nations’ highest court. But the United States denies its jurisdiction, except in cases where Washington explicitly gives its consent.