Alcoa Corporation (ASX:AAI) Chief Executive William Oplinger warned that the Trump administration's plan to slap a tariff on aluminum imports could result in 100,000 job losses in the US, according to multiple media reports on Tuesday.

Speaking at the BMO Global Metals and Mining Conference in Florida, Oplinger said the looming tariffs would slash 20,000 roles within the US aluminum industry and a further 80,000 jobs in supporting sectors, Reuters and CNN reported.

Oplinger sees 35% tariffs for Alcoa, taking into account the 10% tariff on Canadian energy or critical mineral goods and the 25% levy on steel and aluminum. The tariffs will take effect next month.

The Australian aluminum producer's shares were down nearly 2% in recent trade.