The Latest: Brazilians choose between Lula and Flávio Bolsonaro in presidential runoff

Brazilians are voting Sunday in a presidential runoff that pits leftist incumbent Luiz Inácio Lula da Silva against Sen. Flávio Bolsonaro , a far-right ally of U.S. President Donald Trump.

Bolsonaro, the son of imprisoned former President Jair Bolsonaro , bested Lula by more than 2.2 million votes in the first round of the election earlier this month. More than 33 million of the nearly 160 million registered voters did not turn out.

The difference between the two candidates is stark. Bolsonaro and Lula have opposing ideological views on issues ranging from U.S.-Brazil relations and climate change to social welfare. A win for Bolsonaro would signify a pivot to the right by Latin America’s most populous country and its largest economy in a year when Trump allies have notched victories in Chile, Peru and Colombia.

Here's the latest:

In Brazil, voting is fully electronic — meaning votes are counted much more quickly than in some other countries.

Polls opened at 8 a.m. and will close at 5 p.m. Brasilia time (2000 GMT) in most of the country.

On the ballot: the presidential face-off between Lula and Bolsonaro and six gubernatorial races. Votes are tallied quickly because each ballot box calculates results locally and prints a paper summary. The encrypted data is transmitted via secure networks to the nation’s top electoral court in capital Brasilia, which aggregates and publishes the counts within hours.

The system has been in place since the 1990s with few questioning its efficiency. One of its critics is former President Bolsonaro.