Migrant caravan members unfazed by Trump: 'He'll change his thinking'

Many of the migrants trekking to the US-Mexico border express optimism in their vision of the US as president tweets: ‘Go back to your country’Where is the migrant caravan from – and what will happen to it at the border?Hoping to avoid crushing tropical heat – and the attention of Mexican immigration officials – members of the migrant caravan began walking before dawn on Friday as they began a punishing 100km (62 mile) trek to the next station on their journey. Rela