Pompeo traveled to Mexico City Friday to meet with Mexican officials to find ways to help stop a caravan of thousands of migrants heading to the United States. "Foreign Secretary Videgaray and I have talked about the importance of stopping this flow before it reaches the US border". And what will happen if they do?
The caravan quickly grabbed the attention of world leaders as word of its formation spread over the weekend.
During a press briefing in Arizona on Friday, the President reminded reporters the groups are not "little angels" but rather "hardened criminals".
Organizers of the caravan said a section of the crowd had confronted the police and spoiled what had been an orderly attempt to cross into Mexico.
And while immigration was a key issue in the president's 2016 victory, a CBS News poll out Friday says his approval rating on immigration is just 39 percent- the lowest on any issue.
Still, the idea that Mexico could close its porous southern border - or that the United States would choke off the lucrative trade and other traffic between the two nations - strained the imagination.
On the Mexican side, the foreign ministry said its government was in constant communication with members of the caravan explaining the migrants' options. Later, he retweeted a video of Mexican federal police arriving at the Guatemalan border and wrote: "Thank you Mexico, we look forward to working with you!"
A bridge over the river marks an official crossing point.
Some migrants used a rope to jump off the bridge and swim across the river or hitch a ride on the many rafts that cross it regularly. Mexico reportedly responded by sending police to its own southern border to stop the caravan from coming through after the threat was made. Those who do so will be held "at a migratory station" for up to 45 business days. "These are tough, tough people and I don't want them in our country".
Hundreds of Central American migrants remain stuck on the border between Guatemala and Mexico.
Young men began tugging on the fencing and finally succeeded in tearing it down, and men, women and children rushed through and toward the border bridge just up the road. A complicated mix of pressures are weighing on Mexican officials as they decide how to handle the matter.
In Mexico, authorities say that any immigrant who crosses the border illegally will be deported.
On Thursday, Trump branded the migrants an "onslaught" and an "assault on our country" in a series of typically fiery tweets.
A caravan of some 3,000 migrants fleeing Honduras is continuing to walk north to the U.S. border, as Trump threatened to deploy the military and close the U.S. -Mexico border.
En route to Mexico, Mr. Pompeo stopped Thursday in Panama City, where he addressed U.S. -Panama economic ties and cooperation on counternarcotics efforts.
It's also about Mexican emigrants living overseas, many of whom are undocumented.
Mexican Foreign Relations Secretary Luis Videgaray said those with passports and valid visas would be let in immediately, though he acknowledged that "we anticipate those are the minority".
He called for the military to confront the latest caravan and has threatened to cut aid to countries that allow them to advance towards the United States.
His successor, Andres Manuel Lopez Obrador, takes office December 1.
The director of the Americas for Amnesty International, Erika Guevara Rosas, tweeted: "Honduran migrant caravan is not a security threat, but an act of survival by 100s of people escaping extreme violence, poverty, exclusion, and the inability of their government to protect their rights". The move has been welcomed by the United States president. He should be happy because we're going to work.