VIDEO: Donald Trump urges 'complete shutdown' on Muslims entering US

Republican presidential candidate Donald Trump has called for a “complete shutdown of Muslims entering the United States”, an idea that prompted one of his rivals to call him “unhinged”.

The proposed ban would apply to immigrants and visitors alike, a sweeping prohibition affecting all adherents of Islam who want to come to the US. The idea also raised immediate questions about whether it could pass muster under constitutional protections of the free exercise of religion.