Whine,whine,whine.
He hasn't purchased more because there is no NEED to purchase more at this time because the Dims and their RINO buttboys and girls keep throwing up financial and political roadblocks because both know that without the illegal alien vote,they are history.
Acquiring the land is simple. He can use imminent domain to just seize the land and/or right of way necessary,and pay them what the court determines is fair market value. The problem is and will continue to be the Dims/RINO's that are desperate to see him fail by trying every trick in the book to shut off the money.