Top Senate Democrats are trying to put the brakes on President-elect Donald Trump’s Cabinet picks, insisting on extensive financial information on some of the wealthiest Americans before moving forward on nominations. Frustrated by the slow response of billionaires and multimillionaires to their request, 16 Democrats delivered an ultimatum Thursday, saying no committee should vote on a nominee until the individual has cleared an FBI background check, provided a financial report and an ethics agreement with the Office of Government Ethics, and responded to “reasonable requests for additional information” such as tax returns.