christine chung with the new york times, thank you so much. >> thank you for having me. new pledge of support today for a likely democratic presidential nominee, kamala harris. >> a union today endorsed her campaign. while some members of congress, including a number of democrats, launched their campaign against her. and we're enjoying milder weather as we look live outside, drew will fill us in on the stage for a rally in houston. meanwhile, in congress, house republicans and a few six democrats passed a resolution criticizing harris for her work on the border. abc news reporter christiane cordero has the latest from washington. >> while speaking in front of a major teachers union today, vice president kamala harris rallied supporters to fight against former president donald trump and what she calls his extreme allies. >> while you teach students about democracy and representative government extremists attack the sacred freedom to vote teachers union, one of several organizations now formally endorsing harris for president. >> the party's top leaders also appear united