Brazilian President Dilma Rousseff is fighting for her political survival.
Rousseff asked the top court for an injunction to suspend Sunday’s lower house vote until the full court can rule on what he called procedural flaws in the impeachment process.
The Supreme Court has called an extraordinary meeting later to discuss a complaint by a party allied to Rousseff over the impeachment procedure.
Political uncertainty has increased in Brazil since last week, when the country’s largest party pulled out of Rousseff’s governing coalition.
The political crisis has cast a cloud over the world’s seventh largest economy, which is already struggling with a deep recession.