illegal border crossings? >> the point is not about criminalization. that has given donald trump the tool to break families apart. >> you are playing into donald trump's hands, the challenge isn't that it is a little offense to cross the border. the challenge is that donald trump is president and using this to rip families apart. >> reporter: we can expect tonight for healthcare to be front and center again. medicare for all, kamala harris has put forth kamalacare, sanders in the lead up for tonight was attacking kamala harris's medicare for all. we will see what that brings and all eyes will be on the front runner still leading in the latest poll, joe biden at 33%. we will see what we get tonight. heather: along night, 3 hours of debate.