Republicans finish tax bill, gain support from Rubio, Corker

By Amanda Becker and Richard CowanWASHINGTON (Reuters) - Republican negotiators in the U.S. Congress put the finishing touches on a sweeping tax overhaul on Friday and picked up support from two more wavering senators as they raced toward votes on final approval next week.Republican Senators Marco Rubio and Bob Corker announced support for the tax package after Republican negotiators signed off on a final measure.The details of the bill will be published when the full House of Representatives co