Has been admitted to hospital with a tentative diagnosis of a tumor after suffering months of abdominal pain.
President Cristina Fernandez said to be suffering an infection or inflammation of the colon.
Incumbent President Dilma Rousseff appears to be the favorite to win Sunday's runoff against Aecio Neves.
Brazilian Socialist Party throws support behind President Dilma Rousseff's challenger.
The decision will come on October 15, even as Madrid insists a vote on independance would be illegal.
Incumbent Dilma Rousseff wins most votes, but will need to face rival Aecio Neves in a run-off.
Ruling made as Argentina refuses to obey an order to repay the debt it owes to two U.S. hedge funds.
Weeks before an October run-off, Brazil's President Dilma Rousseff is regaining momentum.
Thousands gather in Caracas to denounce the recent approval of sanctions by the U.S.
Prime minister Laurent Lamothe stepped down after violent protests over delayed elections.
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