LONDON – British Prime Minister Boris Johnson has strongly defended his government's plan to override sections of the Brexit deal he negotiated with the European Union, arguing that the EU has an “extreme” interpretation of the treaty that could jeopardize the U.K.'s future.In a column published Saturday in The Daily Telegraph, Johnson said the government's Internal Market Bill is needed to end EU threats to impose a “blockade” in the Irish Sea that the prime minister asserted could “carve up our country.” The legislation, which the British government has conceded violates international law in places, has prompted a furious outcry within the EU and Johnson's Conservative Party.