French Finance Minister Bruno Le Maire said the European Union would strike back against the U.S. if President Trump follows through on a plan to impose tariffs on French imports, in what could develop into a trans-Atlantic tit-for-tat on trade. On Monday, the Trump administration proposed tariffs of up to 100% against $2.4 billion of French imports—ranging from cheese and wine to handbags and porcelain—saying the nation’s new digital-services tax unfairly targets U.S. tech companies such as Apple Inc. and Alphabet…