NEW YORK — Donald Trump is taking his first steps toward broadening his primary insurgency into a full-fledged general election campaign, moving to unite a fractured Republican Party behind him and begin raising the massive amounts of money needed for a national race. Trump began to reach out to party heavyweights, including making efforts to repair his at-times strained relationships with the Republican National Committee and GOP donors whom he bashed repeatedly during the primary. His campaign also named Steven Mnuchin as its national finance chairman Thursday, saying in a statement that "he brings unprecedented experience and expertise to a fundraising operation that will benefit the Republican Party and ultimately defeat Hillary Clinton." Mnuchin is chairman and chief executive officer of Dune Capital management LLC, a private investment firm, and previously worked at the New York bank Goldman Sachs. The process begins just days after Trump's final two intraparty foes, Ted Cruz and John Kasich, suddenly dropped out, clearing his path to the nomination -- as members of the celebrity businessman's campaign were set to meet with the RNC and enter a joint fundraising agreement needed for both his bid and Republicans to maintain control of Capitol Hill, aides said. "In order to really govern, we need majorities in the House and Senate.