They fought this bill hard because the tax proceeds are being given away to corporations with a massive reduction in the corporate rate (along with other giveaw

They fought this bill hard because the tax proceeds are being given away to corporations with a massive reduction in the corporate rate (along with other giveaways that benefit the wealthy such as lowering personal income taxes and raising the threshold for the estate tax), in direct contravention to their policy goals. Had the Republicans chosen not to use this opportunity to go for broke while they're in control of Congress and the White House, they'd have Democratic support.