SAO PAULO (AP) — Brazil's right-leaning presidential hopeful Geraldo Alckmin has picked a senator favored by farming leaders as his running mate for October's election.

Alckmin used social media to announce Sen. Ana Amelia as his choice for vice president.

Former Sao Paulo Gov. Alckmin is a member of the Brazilian Social Democracy Party, while 73-year-old conservative Amelia belongs to the Progressive Party.

The Progressive Party has been frequently investigated by Brazil's top court.

Alckmin is struggling to top 10 percent in the polls and faces stiff opposition from Congressman Jair Bolsonaro.

Bolsonaro is running second with 20 percent of voter support.

For now, jailed former President Luiz Inacio Lula da Silva leads with more than 30 percent, but he will likely be barred from running.