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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...

for homes and small businesses? >> senator, we've already committed $21 million, and that's a down payment. >> that is a down payment. will you commit to these innocent families do not lose their life savings and their homes and small businesses? the right thing to do is to say yes, we will. >> senator, i'm committed to doing what's right for the community. and we're going to be there -- >> no. what's right for the community will then be balanced -- >> shaw also refusing to commit to pausing stock buybacks or offering paid sick leave for all norfolk southern employees. >> i will comm...

♪ you're live in the "cnn newsroom." i'm jim acosta in washington. and we begin this hour with the war in ukraine and its global implications. the director of the cia confirms what cnn has been reporting that the u.s. is confident that china is thinking about providing lethal aid to russian troops in ukraine. the agency does not believe a final decision has been made. and today, the white house is urging caution. >> you know, beijing will have to make its own decisions about how it proceeds. whether tell provides military assistance. but if it goes down that road it will come at ...