It seems he might be continuing the Trump plan, or maybe I'm too half-full.

The people familiar with the plan said Mexico would deploy security forces to cut the flow of migrants, the bulk of whom come from Central America’s so-called Northern Triangle of Guatemala, El Salvador and Honduras, whose economies were battered by the coronavirus pandemic and hurricanes last year.

https://www.reuters.com/article/us-usa-immigration-mexico-exclusive/exclusive-mexico-plans-migration-crackdown-as-u-s-struggles-with-record-arrivals-sources-idUSKBN2B91L4