A caravan of more than 7,000 
 is heading to the USA on a thousand-kilometre 
 through Mexico. They are  from Honduras and want to find a  life in the U.S. Many are parents with  children. They are fleeing the violence and a  of job opportunities back home. A reporter said the caravan was "a  of people". They are battling hot weather,  food and exhaustion in their flight. Many in the caravan were recently deported from the U.S. after having lived there  for decades. They are desperate to go back to be with their children  living in the U.S.
The U.S. government made it  that it would stick to its asylum . It will turn away  who doesn't apply for  in Mexico first. It has a "zero-" policy towards migrants to stop people from trying to enter the country illegally. There was  earlier this year after  separated migrant children from their parents at the . President Donald Trump tweeted: "Sadly, it looks like Mexico's police...are unable to stop the caravan... Criminals and  Middle Easterners are mixed in." He has vowed to cut  aid to Guatemala and Honduras.