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Obviously that is devastating news to our national security and to the pentagon. >> reporter: as for mattis' potential replacement, finding someone for the job on the same page as the president could be difficult. >> there are talented individuals. but will ha raise a hand and say yeah, i'll take this job. >> and you're watching "newsroom." still ahead, the man overseeing the russian probe and other investigations is already feeling the heat from his boss. we'll have details. and also ahead, days of chaos at one of the uk's busiest airports may finally be over. we'll have the latest on the i...

I consider that an asset, not a liability. >> the american troop withdrawals along with the resignation left america's allies in europe and across the world, stunned. >> this is a day america's allies have been dreading and fearing and hoping wouldn't come. >> and even the president's staunchest allies at home not pulling punches. >> secretary mattis's departure is devastating news to national security and to the pentagon. >> as for mattis's replacement, finding someone on the same page as the president could be difficult. >> there'sal lenlt talented ind that will come forward. the question is...

Obviously that is devastating news to our national security and to the pentagon. >> reporter: as for mattis's potential replacement, finding someone for the job on the same page as the president could be difficult. >> there are talented individuals that will come forward. the essence of the question is are they going to want to raise their hand and say, "yeah, i'll take the job." one the surprises has been from u.s. forces deployed in afghanistan and syria. i want to share one of them, wolf. it gets to a point that you hear broadly. this is coming from a special operatio operations commander j...

Unambiguous in our approach to those countries whose strategic interests are increasingly intentioned with ours. the president seeming to rebut that line this morning via twitter writing, quote, there has never been a president who has been tougher but fair on china or russia. never. just look at the facts. >> if putin likes donald trump, i consider that an asset, not a liability. >> reporter: the american troop withdrawals, along with mattis' resignation have left america's allies in europe and across the globe stunned. >> this is a day that america's allies have been dreading and fearing. an...