Donald Trump has moved to take over the financial apparatus of the Republican National Committee, despite tensions within the party over his role as the presumptive presidential nominee. Trump has said he needs up to $1.5 billion for the general election after pouring $40 million of his own money into the primaries. But Trump lacks his own fundraising infrastructure, and Republican megadonors like the Koch brothers have so far hedged at backing him. On Monday, House Speaker Paul Ryan said he would step down as chairman of the Republican National Convention if Trump asked him to. While Trump has all but sealed the nomination, voters still head to the polls today for Republican primaries in West Virginia and Nebraska.