Senate Republican leader backs investigation into Russian hacking

By Dustin Volz and Patricia Zengerle WASHINGTON (Reuters) - The top Senate Republican broke with President-elect Donald Trump on Monday over whether Russian hacking during the U.S. election merited closer scrutiny, a fissure between Trump and his party that appeared to grow as lawmakers pressed for a special investigation into the matter. The divide raised the possibility of enduring clashes between Trump and Republicans during his presidency over how to handle Russian President Vladimir Putin,