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china officials as the two nations re-open diplomatic talks. >> we're not looking for a new cold war. >> can the u.s. counter rising global threats? i'll speak to two republican chairman congressman michael mccall of foreign affairs, plus u.n. ambassador linda thomas greenfield will join us. and desperate for answers. ohio residents on edge after a train derailment unleashes toxins. >> we need help. >> how to pro vent the next crash. >> sherrod brown joins us next. >> laying the field, former president trump gets his first official challenger for the gop presidential nomination. >> i...

China officials as the two nations re-open diplomatic talks. >> we're not looking for a new cold war. >> can the u.s. counter rising global threats? i'll speak to two republican chairman congressman michael mccall of foreign affairs, plus u.n. ambassador linda thomas greenfield will join us. and desperate for answers. ohio residents on edge after a train derailment unleashes toxins. >> we need help. >> how to pro vent the next crash. >> sherrod brown joins us next. >> laying the field, former president trump gets his first official challenger for the gop presidential nomination. >> if you're t...