Obstruction. Robert muellers testimony on capitol hill delayed as democrats subpoena new witnesses in the russia investigation. Well discuss how democrats show down with the president with assistant speaker, and its a Fox News Sunday exclusive. Plus the very public feud usbetween Speaker Pelosi and the left wing of her party. Well ask our sunday panel about the democratic divide. All right now, on Fox News Sunday. And hello again from fox news in washington. We begin with breaking news. The threat of disastrous flooding across the gulf coast as now Tropical Storm barry brings high winds and drenching rain to mississippi and louisiana. After briefly becoming a category i hurricane the first of the season the system made landfall saturday about three hours west of new orleans. Casey stiegal is there. Barry continues to weaken but officials warn the threat is far from over. We still f have a significant amount of rain coming our way. While no major injuries or deaths have been reported a