Even before he was president, candidate Donald Trump wasn’t shy about criticizing judges he thought had made questionable decisions.

That has continued in his first month in the White House. When federal Judge James Robart temporarily blocked the administration’s travel ban, Trump tweeted that Robart was a “so-called judge.”

Comments like those have led to judges and the American judicial system generally becoming less popular among the public.

Joseph Ura, an associate professor of political science at Texas A&M, has co-written a study called "Confidence and Constraint: Public Opinion and the Roberts Court."

Part of the study calls for Chief Justice John Roberts to speak out publicly against some of the president’s comments. We spoke with Ura.