Whether it is clear or not preliminarily depends on the view of his legal team, not someone off the sidewalk like you and me. Ultimately, of course, the question is decided by the USSC not some lower court.
There are always back-up plans and work-arounds; but it could be Game Over, if the dems, the RINOs, the deep state and the establishment with its MSM get a USSC decision that Trump is acting unconstitutionally.
The Supreme Court is not the final arbiter and you should know that.