In 2014, Mexico began to more heavily crackdown on these transient migrants. According to Mexican officials, the "Plan Frontera Sur" (Southern Border Plan) is designed to retake control of the historically porous southern border and protect migrants from transnational crime groups. However, the measures have been widely attributed to pressure from the United States, who does not want a repeat of 2014, when a surge of tens of thousands of women and children clogged up American immigration courts and resulted in a severe lack of space in detention centers at the US-Mexico border. More than 45,000 migrants from Central America were deported from Mexico between January and April 2019. In January 2020, Mexico detained 800 migrants who entered it illegally from Guatemala to reach the United States as part of the strict measures taken by the Mexican authorities to reduce migration to the United States through Mexico.