Days after pledging to "stand up for our dairy farmers" on the stump in Wisconsin, President Trump again lashed out against one of his new favorite trade topics — Canadian import tariffs — on Twitter this morning:

Canada's moo-tives: Canada has always had a high import tax on dairy products to prop up its domestic market, but Trump is mad because the country recently closed a loophole that allowed U.S. farmers to sell "ultrafiltered milk" used in cheese and yogurt production, without a tax — a market worth nearly $100 million to U.S. farmers, per The Globe and Mail.