 Securing America. In a major reversal for President Biden, the administration will now help deport U.S.-bound migrants before they even reach the border, striking a deal with Panama to screen and deport migrants at the Darien Gap, the only land crossing between South and Central America, and a major stepping stone for migrants who often fly into South America. Some 520,000 migrants used the Gap last year. Here's Wilson Center's Beatrice Nice.