President Donald Trump is pursuing a potential deal to buy Belarusian potash at a price substantially below what the United States pays Canada, but the proposal faces questions over supply, sanctions and transportation. Canada supplies roughly 80% of U.S. potash imports, according to the latest account, compared with an earlier estimate of about 90% of the 13 million tons of potassium fertilizer imported last year. Belarus is landlocked, has lost its main export route through Lithuania and would need to ship cargo through Russia before reaching the United States. Belarusian President Alexander Lukashenko has said sales to the United States resumed after Washington eased sanctions on Belarusian producers, although it remains unclear how much Belarus can add to U.S. shipments. Earlier reporting said Belarus could not supply large volumes because its output was already committed. The proposal could give farmers another source of potassium fertilizer, but shipping costs and sanctions could undermine any price advantage over Canadian supplies.