Concerns about the clock ticking on the U.S. administration's first year in office are growing as the initial hype over the breadth and speed of legislative changes to be effected has ceded to question marks over what the government will be able achieve this calendar year.

Given the impending holiday season, there is "no time left in Washington" to push through the legislative changes that markets and the broader population are anticipating, James D. Boys, political historian at Richmond University, told CNBC's Squawk Box on Tuesday.