U.S. tariffs on steel and aluminum imports are poised to escalate costs for the oilfield service companies behind North America's vast energy industry, as their operations rely heavily on these metals.

Australia will not be exempt from U.S. steel and aluminium tariffs that President Donald Trump's administration will impose on Wednesday, Australian media reported, citing a White House official. Trump agreed in February to consider exempting Australia from the tariffs in view of the U.

Trump said he would increase from 25% to 50% tariffs taking effect Wednesday for Canada after Ontario said it would raise electricity prices on U.S.

Canada could impose non-tariff measures such as restricting its oil exports to the United States or levying export duties on products if a trade dispute with the United States escalates further, Canada's energy minister Jonathan Wilkinson said on Tuesday.

President Donald Trump has made it through his first 50 days of his second term. See what national, state polls are saying about his approval rating

US Energy Secretary Chris Wright said the Trump administration is prepared to enforce US sanctions on Iranian oil production.

A letter from U.S. President Donald Trump to Iran's clerical establishment has been delivered by Anwar Gargash, diplomatic adviser to the president of the United Arab Emirates, Iran's foreign ministry spokesperson and state media said on Wednesday.