Trump says will impose car tariffs if Mexico doesn't control border

President Donald Trump on Thursday retreated from his threat to close the US-Mexican border imminently, warning he will instead impose car tariffs if the major US trading partner doesn't do more to stop undocumented migrants and drug smugglers."If Mexico doesn't give the help, that's OK, we're going to tariff their cars," Trump said at the White House.Trump said he was giving Mexico one year to get the cross-border drug trade down before he imposes tariffs.