The United States and Mexico plan to clamp down on illegal immigration at their shared border, leaders from both countries said on Monday, vowing to disrupt irregular crossings that have reached record levels in recent years. In a phone conversation on Sunday, U.S. President Joe Biden and Mexican President Andres Manuel Lopez Obrador said their administrations would soon take steps to decrease illegal crossings while also addressing the economic and security problems that cause people to migrate. The U.S. Border Patrol caught, opens new tab a monthly record of 250,000 migrants crossing illegally in December, but numbers have dropped significantly since then, with 137,000 arrests in March.