Fresh off his tax bill victory, President Donald Trump plans to kick off 2018 with a renewed push for a massive infrastructure spending program, a key campaign promise which he recently described as "the easiest of all" to achieve but one that could face some significant roadblocks in the months ahead. The White House is planning a "mid-to-late January" roll out of the president's infrastructure plan leading up to his first State of the Union address on January 30, where rebuilding the nation's roads, bridges, airports and railways is expected to be a major theme, an administration official tells ABC News.