US President Donald Trump said foreign companies that fail to build factories in the United States could face tariffs of up to 300 percent. He made the remarks Saturday at a campaign rally in Vandalia, Ohio, while campaigning for Republican candidates ahead of the Nov. 3 midterm elections. South Korea is separately facing pressure from Washington over how it will carry out its $350 billion investment commitment in the United States. Trump presented tariffs and foreign investment as part of his economic record.