Exactly, this is not a border security issue, it is a political issue, and Trump is beholden to people who want to deport DACA beneficiaries, despite his bullshit today about a DACA for wall swap being on the table and the Dems obstructing (Pence just said on Thursday that Trump was waiting on the SCOTUS to rule, believing that DACA will be ruled to be unconstitutional), when he changed his mind about that deal last year, and when he changed his mind last month, both because of the shit he was getting from right wing idealists. Trump has no beliefs, he has no spine, he can't make a decision and has allowed the country to be pulled into a "Mexican standoff" between him, Coulter/Breitbart, McConnell/ most GOP senators, and Pelosi/Schumer.
And beyond even that, Trump hasn't even committed like 40% of the $1.6 billion he was given in the last fiscal year for border security, and has only actually spent like 6% of that $1.6 billion.