Democrats in Congress have a new and somewhat surprising tool at their disposal in the era of one-party Republican rule in President Trump’s Washington: power. It turns out that Republicans need the minority party to help them avoid a government shutdown at the end of April, when the current spending deal to fund the government expires. And Democrats have decided, for now at least, that they will use their leverage to reassert themselves and ensure the continued funding of their top priorities — by negotiating with Republicans.