(Reuters) -Shares of BlueScope Steel rose to a more than two-month high on Monday, buoyed by expectation that the Australian steelmaker's U.S. business would gain from potential tariffs on all steel imports into the country. U.S. President Donald Trump said he would introduce new 25% tariffs on all steel and aluminium imports into the country, on top of existing metals duties, in another major escalation of his trade policy overhaul. The largest sources of U.S. steel imports are Canada, Brazil and Mexico, followed by South Korea and Vietnam, according to government and American Iron and Steel Institute data.