Big protests across nation put leader's future in doubt

Analysts say strong turnout could lead to the unraveling of Rousseff's fragile governing coalition

Mammoth demonstrations across Brazil are putting even more pressure on embattled President Dilma Rousseff as she heads into a tough week in her attempt to survive impeachment proceedings in Congress.

According to police estimates, a total of 3 million people took to the streets in 200 cities on Sunday calling on the president to resign amid widespread anger over corruption investigations and the worst recession in years.