WASHINGTON (Reuters) - U.S. House Speaker Paul Ryan on Wednesday left the door open to a possible delay in when Republican’s tax cut plan would lower rates for corporations, following a media report that Senate Republican’s version of the overhaul would push it to 2019. Asked if Republicans in the U.S. House of Representatives  would consider such a phase-in, Ryan told Fox News Radio that the House corporate rate cut was immediate and permanent, but that both chambers would work out the difference between their bills. “This is a long process,” he said, adding that he could not speak to details in the Senate plan.  