The right-wing politician, whose campaign centred on fighting crime and revitalising the economy, received around 56% of the vote on Sunday. But his rival Luisa González has demanded a recount.
Self-exiled Venezuelan opposition leader Edmundo González says his son-in-law was kidnapped on Tuesday in the Venezuelan capital, Caracas.
Both president Nicolás Maduro and opposition leader María Corina Machado, who is currently in hiding, have urged their supporters to take to the streets on Friday.