Except for dying in office, I don't think there is anything that President Trump can do that will make MSW happy. Whether Mr. Trump's administration is a success or failure will depend upon the Americans. Whether Brexit is a success or failure will depend upon the British people.  

The Catholic Church has largely lost it's power and influence in the States. As for Pope Francis, there will be another conclave before the next four years is up. Don't look for the Catholic Church and Francis to effectively oppose President Trump. If there is a church leader with influence, it is Patriarch Kirill.