Nippon Steel Corp. said Friday it will postpone arrangements to complete its acquisition of United States Steel Corp. by three months through December, with the deal having become a hot-button topic in the leadup to November’s presidential election. Donald Trump, the presumptive Republican presidential candidate, has said he would block the $14.1 billion buyout of the American company while President Joe Biden has also expressed support for unionized workers who oppose the Japanese steelmaker’s takeover. Nippon Steel said its latest decision came after considering the possible timing of U.S. r…