U.S. intelligence officials are watching for any influence campaigns from Russia or China that are aimed at amplifying existing political divisions or stoking unrest among Americans over the indictment of former President Donald Trump, according to two U.S. officials.Officials have been on alert since the indictment was confirmed last week and so far have not seen significant signs of Russian or Chinese interference in the country’s political discourse beyond the efforts that have become standard, the U.S. officials said.But after Trump’s arraignment Tuesday, one of the officials said the intelligence community is watching “very closely” for any signs of such...