Can the SCOTUS hold bidunce in contempt and lock him up if the mal-administration ignores the ruling?
SCOTUS has, on more than one occasion, issued opinions that POTUS has ignored. Happens rarely, but it has happened. This source suggests that most of the time, U.S. presidents will acquiesce to SCOTUS rulings. We saw Obama, through his Interior Secretary, flip the bird to a federal district court when he (Salazar) lifted and reinstituted an oil drilling moratorium in the Gulf of Mexico. Salazar was cited in the resulting lawsuit, and he was held in contempt by that court. Obama never appeared before that court, and he sure as hell wasn't carted off to a detention cell, so in a sense he got away with it.
The crux of the matter is, this is not the first time that the Executive and Legislative branches of government has ignored or disregarded a SCOTUS ruling.
Judicial Supremacy has long been a bulwark of government, but there are opposing viewpoints that cite
departmentalism (the idea that the Executive Branch can read COTUS just fine, TYVM, and decide what applies and what does not). Paulsen-Whelan also opine that judicial supremacy is a myth, but that view is obviously not shared by everybody.
As they say, it's complicated.
One thing is for sure -- Roberts is a spineless coward who wouldn't dare go against a U.S. president or Congress when those entities flip SCOTUS the bird.
https://reason.com/2015/06/04/can-the-president-lawfully-ignore-a-supr/https://www.huffpost.com/entry/gingrich-supreme-court_b_1017418https://politicalvelcraft.org/2012/02/08/obama-found-in-contempt-of-court-gulf-drilling-moratorium-u-s-federal-judge-rules/