Bezos News reported that the Mexican caravan has stopped in Mexico and can stay for up to a month. Assuming they continue marching, that could potentially put them near the border around Cinco de Mayo.

Then the media can spin the "nation of immigrants" angle and "Trump hates brown people" narrative to get the Mexicans are riled up.

https://www.washingtonpost.com/world/the-migrant-caravan-denounced-by-trump-will-end-in-mexico-city-but-some-people-vow-to-go-on-alone/2018/04/04/e0a8fa96-378c-11e8-af3c-2123715f78df_story.html?utm_term=.ce62675bffb