Brazil’s President Dilma Rousseff has asked the Supreme Court to block impeachment proceedings against her in a final attempt to stop the process hours before a crucial Senate vote.
Ms Rousseff’s lawyers alleged bias and irregularities. Similar attempts have been rejected by the court.
Reports said Ms Rousseff could be suspended for 180 days if the senators vote for a full trial on Wednesday.
Her supporters set up burning barricades and blocked roads.
The roadblocks caused widespread disruption across all Brazilian states.
Acting speaker of the lower house of Congress, Waldir Maranhao, expressed shock on Tuesday when, less than 24 hours after suspending a vote in the chamber that had allowed the impeachment process to go ahead, he reversed his decision.
Previously he had argued that “the 17th April vote had breached Congress rules”.
Members had voted overwhelmingly in favour of the impeachment process going ahead.
The president is accused of illegally manipulating finances to hide a growing public deficit ahead of her re-election in 2014, which she denies.