the video asked the question in the context of the agrego garcia drama and whether trump would abide and follow the constitution

regarding the constitution and the oath

people of any nation or even citizens of america are not suppose to know every word of the constitution by heart.
they are also not responsible to uphold the constitution

to uphold is different than to "preserve, protect and defend"

and as to the best of his ability. well thats why he employs lawyers as do other citizens when constitutional issues arise.
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people break constitutional rights all the time, but its upto the courts to decide not only if the issue is within the constitution but also if there was a breach and if the courts even have powers to decide on the cases of such

and thats a matter for the lawyers to fight over

by trump not being a lawyer its not in his ability to do certain things, thats why he employs lawyers, advisers, etc
as he is not suppose to be an expert of everything just to become a president. he can only do whats within his ability

his ability is more so to ensure funding the DOJ(court system) so that there are courts available for citizens and lawyers to utilise and ensure the court system can mediate and judge on constitutional matters that the judicial branch have power of

as for immigration. thats for the political/executive branch to have powers of making ruling over not the judicial