Protesters rally against Brazil’s president

SAO PAULO — Brazilians took to the streets on Sunday for a day of nationwide protests against embattled President Dilma Rousseff that are widely seen as a key test of her ability to weather the political and economic crises lashing the country.

The president faces impeachment proceedings over alleged fiscal mismanagement with the country in the throes of the worst recession in decades and amid a sprawling investigation into corruption at the state-run oil giant Petrobras.

Organizers estimated that about 1 million people turned out in Rio de Janeiro, but police officials — whose crowd estimates are generally a fraction of that of organizers — did not provide their own count.

The Petrobras scandal has ensnared key figures from Rousseff’s Workers’ Party, including her predecessor and mentor, former President Luiz Inacio Lula da Silva, as well as members of opposition parties.