Argentina will hold primary elections on Sunday with market-friendly incumbent Mauricio Macri expected to come in behind the populist-leaning opposition candidate. The market reaction, economists say, depends how big the margin.

A strong primary showing by opposition candidate Alberto Fernandez could increase worries that Macri may be unable to overtake him in time for the general election in October.

Argentine sovereign bonds were also pressed about 2% lower in early trade, reflecting local election and global trade jitters after US President Donald Trump said on Thursday that Beijing had not fulfilled a promise to buy large volumes of US farm products and vowed to impose new tariffs.

Beijing is honoring its pledges to buy US agricultural products, state media cited China's state planning body saying, dismissing Trump's accusation.