Donald Trump is poised to lift tariffs on some Canadian products as Republicans in border states lobby for relief from trade actions that have put them in a shaky political position ahead of November's midterms.

Maine Republican Sen. Susan Collins said on Friday that the Trump administration will scrap tariffs on some paper and plastic products, refrigeration and packaging equipment, agricultural machinery and seaweed and algae products, among others, after she relayed how damaging these levies have been for consumers and businesses in her state.

Trump hit these products with a 50 per cent tariff in August, apparently retaliating for Canada's countermeasures on some U.S. goods that were imposed after the president first launched his trade war last year.