randy weingarten, if you want to learn more about the organization, you can follow on twitter at aft union. thank you for the conversation this morning. guest: thank you. host: when we come back, joining his life from texas near the mexican border will be mark kr ikorian from the center for immigration studies. after that, more of your calls and comments. >> american history tv saturdays on c-span2, exploring the people and events that tell the american story. at 1 p.m. eastern county discussion on the advanced placement u.s. history exam with co-authors of fabric of a nation, a brief history with skills and resources for the u.s. history course. they will explain how this year's course is structured and provides strategies for answering questions and analyze historical documents. at 2 p.m. eastern on the presidency, scholars will look to see how the presidency changed in the first two decades of the 21st century under president bush, obama, trump and biden, including a look at the presidency of bill clinton. exploring the american story, watch american history tv saturday on c-span2 and f