Trump ran into the same problem Dubya and his daddy did in Iraq & Afghanistan- sure we can topple the government and defeat their military. That's easy-peasy. But after we do that, who's gonna run the country? In all cases, the answer is "nobody who is acceptable to the US", so the US ends up having to step in and run the place for a time so that it doesn't immediately devolve into "new boss, same old bullshit". Leave a political vacuum in that part of the world and it gets filled by Al Quaida, ISIS, Taliban, or other radical groups that battle it out among themselves for decades, creating another Lebanon. Or Iraq. Or Afghanistan.