APIn advance of the unveiling next week of President Trump’s fiscal 2018 budget, House Democrats warned on Thursday that they were prepared to go to the mat if necessary to prevent an increase in defense spending at the expense of domestic programs. It was only a matter of time before the simmering controversy over spending parity finally bubbled up. But during a morning press conference on Capitol Hill, leading Democrats on budget and appropriations matters cautioned that they might take Trump up on his threat of a government shutdown in September unless they gain important GOP concessions. "They’re going to need our votes to pass anything," Rep.