Turned to law and politics. although he couldn t shake hands and always clutched a pen in his fist so people wouldn t try. his war time service also gave special focus to much of his work in congress, shaping tax policy, farm programs, and antidiscrimination laws and other measures to make america more accessible to the disabled. summing up his storied career, for tom brokaw, this way. my proudest title is veteran, of all the other titles i ve had. reporter: andrea mitchell, nbc news, washington. now to the nation s battle against covid. in a few hours new travel rules will go into effect for those entering the u.s. as we learn more about the new omicron variant and how dangerous it might be. reporter: tonight a last-minute scramble to get to the u.s. before new travel restrictions go into effect at midnight. it is just really challenging. so much so i don t actually know if we ll be able to do it. reporter: all visitors must now show a negative covid test