MEXICO CITY (Reuters) - Mexican President Andres Manuel Lopez Obrador said on Thursday he would send a letter by next week to U.S. President Joe Biden urging him to help craft a plan to offer work visas to migrants.

       When asked during a regular news conference what steps would be taken to deal with a recent migrant caravan, Lopez Obrador said his government wanted to try to keep migrants in the south of the country so as not to expose them to risks on the journey.

       (Reporting by Cassandra Garrison and Raul Cortes)