U.S. President Donald Trump says U.S. troops have been dispatched to the border with Mexico to prevent a caravan of migrants from crossing into the U.S. At the White House Thursday, the president said "these are tough people. In many cases, you have young men, strong men." He said "anybody throwing rocks...we will consider that a firearm." Trump delivered his remarks before traveling to Missouri for a campaign rally on behalf of Republicans ahead of elections Tuesday. VOA's Zlatica Hoke reports.