Thousands have joined a migrant caravan, estimated to be as many as 7,000 people, as Secretary of State Antony Blinken’s heads to Mexico’s capital for a high-stakes meeting on immigration. #Migrants #Immigration #Blinken Start your day with "Morning in America," NewsNation's live three-hour national morning newscast hosted by Adrienne Bankert and Markie Martin. Weekdays starting at 7a/6C. #MorningInAmerica NewsNation is your source for fact-based, unbiased news for all America. More from NewsNation: newsnationnow.com Get our app: trib.al/TBXgYpp Find us on cable: trib.al/YDOpGyG How to watch on TV or streaming: trib.al/Vu0Ikij