would continue to support having troops in syria for an indefinite period of time, to continue this regime change war. >> what we were doing in sire ya was keeping our word. this president has betrayed american values, our credibility has been tattered. >> reporter: one topic all candidates agree on. >> we have to impeach this president. >> i support this impeachment. >> i don't think it's going to take very long. >> senator cory booker again asking the field to focus on their collective goals, defeating the president. >> tearing each other down because we have a different plan to me is unacceptable. i have seen this script before. it didn't work in 2016, and it will be disaster for us in 2020. >> now, senator bernie sanders walking off the debate stage to great political news.