U.S. customs duty collections surged again in June as President Donald Trump's tariffs gained steam, topping $100 billion for the first time during a fiscal year and helping to produce a surprise $27 billion budget surplus for the month, the Treasury Department reported on Friday. The budget data showed that tariffs are starting to build into a significant revenue contributor for the federal government, with customs duties in June hitting new records, quadrupling to $27.2 billion on a gross basis and $26.6 billion on a net basis after refunds.