Oil prices were little changed on Thursday, maintaining the previous session's losses on uncertainty over how U.S. President Donald Trump's proposed tariffs and energy policies would affect global economic growth and energy demand.

Oil futures headed lower Tuesday as traders weighed President Donald Trump’s vow to boost already record U.S. crude output against the threat of a steep tariff on Canadian imports and a call to replenish the Strategic Petroleum Reserve.

President Donald Trump’s repeated threats to slap steep tariffs on Canada and other friendly nations have left Toronto with some of the world’s worst-performing oil and gas stocks.

Oil prices dipped in Asian trade on Thursday, extending losses amid uncertainty over how U.S. President Donald Trump's proposed tariffs and energy policies would impact global economic growth and energy demand.

Oil futures ended Wednesday at their lowest in almost two weeks, with U.S. benchmark prices notching a fourth straight session decline as investors weighed the potential impact of President Donald Trump’s energy policies and tariff threats.

Oil edged lower after President Donald Trump threatened tariffs on China and the European Union, while traders continued to assess the fallout from unprecedented US sanctions on Russia.