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bannon's change of heart, his trial will go on. also late today, what we learned about tomorrow's january 6th hearing who will testify now? and the other key witness we're expected to hear from. rachel scott with new reporting. the war in ukraine. and tonight, the white house now warning it believes iran is getting ready to help russia. what they're expected to send to fight the ukrainians. james longman standing by, reporting from ukraine. japan in mourning over the assassination of former prime minister shinzo abe. and what we've now learned tonight about the alleged gunman. bo...

heart, his trial will go on. also late today, what we learne hearing. who will testify now? and the other key witness we're. and tonight, the white house now warning it believes iran is getting ready to help russia. what they're expected to send to fight the ukrainians.from japan in mourning over the assassination of former prime minister shinzo abe. and what we've now learned tonight about the alleged gunman. bob woodruff is there. here at home tonight, the urgent manhunt under way for the armed suspect wanted for shootings at several 7-elevens today. multiple people shot across...

Vaccination. and we know vaccination helps address omicron. >> reporter: still undecided on whether crowds will fill times square for new year's eve. as covid infections have upended the worlds of sports and entertainment forcing "saturday night live" to cancel its live audience. the nba, nhl also postponing games and schools like harvard university moving graduate and professional schools to online classes for the first three weeks of january. health workers and government officials increasingly focused on boosters. >> we see those who are vaccinated, those who received their booster, aren't ...

All testing positive for the virus. health workers and government officials increasingly focused on boosters. >> we see that those who are vaccinated, those who have received their booster aren't coming into the hospital at the same rates. >> reporter: moderna today announcing preliminary data show it's half-dose booster shot increased antibody levels against omicron, noting that a larger size dose raised them even more. the company says it's working on variant-specific boosters as well. >> right now, you need that third dose. i wish we'd stop calling it a booster. it's a three-dose vaccine. >...

Director of the cdc. i spoke to him a few minutes ago about the latest developments. dr. besser, good to have you here. let's start off with what we heard from the head of moderna today, suggesting the vaccines may not stand up, may not be as effective against this variant. is that something unexpected to you and what does the trajectory of this pandemic look like if that's the case? >> well, you know, lester, i think that's one of the big reasons why this is being taken so seriously there's a lot of unanswered questions a big one is how effective are the vaccines that are currently being used...