US President Barack Obama has said Republican hopeful Donald Trump would not win the presidency because it is a serious job. Subscribe to BBC News .<br /><br />Donald Trump has been criticised for failing to correct a supporter who said US President Barack Obama was a Muslim and not even an American.<br />Mark Cuban has never been a big fan of Donald Trump. Back in 2012, the two billionaires got into it on Twitter after Trump said he would donate $5 million to .<br />MPs are to debate whether Donald Trump should or should not be banned from the UK, following two online petitions that attracted thousands of signatures.
