provide coverage for undocumented immigrants. i agree and my time s up. reporter: and those that demonstrated strength. and that little girl was me. reporter: this morning the shifting power dynamics debating how far left is too far and the biggest thing we learned this week. my guest, senator can cory booker of new jersey and julio castro of texas. plus historic meeting. president trump meets with kim jong-un at the it dmz. then becomes the first sitting president to step foot in north korea as the two sides agree to more talks. and crisis at the border. this heart breaking photo becomes the indelible image of desperation and despair of stories emerge of children in detention centers. joining me for insight and analysis are nbc news capitol hill correspondent, cathy hunt,