Not unless you are calling him a liar. Although I would call him "flexibly opportunistic," I haven't seen indication of that.
Have you seen him say he would build a wall, or otherwise take immediate action to control the border. I haven't. If I had, I guess you could claim I was calling him a liar, but I haven't seen it.
I just don't see him taking definitive action any more than Bush has.
Seriously, he has talked about the wall. It's on his web site:
Secure The Border. Follow through on Congressional commitment to build a physical and technological fence along the southern border, and secure other points of entry.