I guess Trump has been attacked on so many fronts that he does not know what are the right things to do any more. Now he is doing exactly what Hillary would have done if she had become President: trying to take down the Assad regime. Never mind that neoconservatism is going to destroy America! It is popular right now!
Since Trump has been saying that he will focus on fighting terrorism, I will just talk about how to fight terrorism. Firstly, take a look at why terrorism is not just happening in the Middle East but also in America, Europe (including Russia) and China. People who become radicalized in America, Europe (including Russia) and China are not foreign nationals but mostly citizens or legal residents. These people are radicalized not just because they are inspired by others but mainly because they feel hopeless in some ways for economic or political reasons. If they are not inspired by others, they may still commit violent acts or do drugs or find some other ways to self-destruct, just like any other citizen who is not inspired by Islamic Extremism. To fight terrorism, the problems these people are facing need to be solved. Problems of only part of the population in any society are actually problems of that whole society, not just problems of that part of the population.
Secondly, can countries outside of the Middle East use force to eradicate Islamic Extremism in the Middle East? It depends. Regimes like those in Germany and Japan during WWII were taken down by force by Allies. But so far, have we seen any regime like that popping up in the Middle East? Regimes that may be repressive but are not committing genocide or waging large scale wars against other countries may not be taken down by force. They need to be dealt with in other ways.
Waging wars not for self-defense is self-destructive. That is how empires fall apart, which is illustrated by the fable “The Death of a Camel”. The death of the camel in the story started with a kick at a piece of glass out of anger, which caused a foot to bleed. Then the blood attracted a vulture and a wolf which scared the camel into running until exhaustion, which resulted in the camel falling next to an anthill and getting attacked to death by the ants.
By the way, supporting the Assad regime is a wrong way for Russia to fight terrorism in Russia. And it is considered an interference in Syria’s internal affairs. Russia can be friendly to Syria. But to provide military support to a regime is more than being friendly.