Meet the Press NOW — December 21

Texas Gov. Greg Abbott (R) escalates the political fight over immigration as a record-breaking number of migrants are in custody at the southern border. NBC News Correspondent Vaughn Hillyard explains the legal battles former President Trump faces following the Colorado Supreme Court’s ruling disqualifying him from the state primary ballot. Former U.S. Cybersecurity and Infrastructure Security Agency Chief of Staff Kiersten Todt discusses regulations for artificial intelligence and its potential threat to national security.