BRIGGS: The president of Mexico set to announce today his new plan to contain the flow of migrants from Central America. Mexico committed to a 45-day plan to curb immigration to the U.S. during talks in Washington last week. President Trump has suggested what he calls phase two of tariffs against Mexico if it does not successfully step up immigration enforcement. He says phase two would be very tough. CNN's Michael Holmes with more.</s>MICHAEL HOLMES, CNN CORRESPONDENT: I'm standing here on the Mexican- Guatemalan border. I'm in Mexico. Behind me over there you see Guatemala. And if you see these pontoons back there, that gives you an idea of how difficult the task is going to be for Mexico to stop the flow of migrants from the so-called northern triangle, Honduras, Guatemala, El Salvador. All day long these pontoons have been going back and forth. For $1.20 you can jump on one and come over. It's that easy. Walk up into town and you're on your way. The Mexican government says it's going to outline details of its plan to try to stop the flow of migrants heading to the U.S. border. They're going to do that on Friday. And it's going to be interesting to see how they plan to do it. You're talking about a 540-mile stretch of border with Guatemala. There's forest, there is river like this one, there are mountains. How are they going to police that? What are they going to do? There are 200,000 migrants in this state, Chiapas State, alone and there are half a dozen states happen along this border, so you can see how difficult the task is going to be. They say they're going to put their National Guard in and try to use the National Guard. The National Guard was never designed for this kind of thing. You're going to see police, you're going to see troops. But how many people they're going to be able to get along here and stop this type of movement remains to be seen.</s>ROMANS: All right. Michael Holmes for us there on the border. All right. Summer travel is getting more expensive. Find out which airlines are raising air fares. CNN Business is next.
Mexico to Announce Plan to Control Illegal Immigration