National security advisor Jake Sullivan says Biden told him to oversee a 'massive surge' of weapons deliveries to Ukraine before his term ends

"We are going to do everything in our power for these 50 days to get Ukraine all the tools we possibly can to strengthen their position on the battlefield so that they'll be stronger at the negotiating table," Sullivan said.

"I've encouraged the Ukrainian team to engage the incoming team as well as to engage all of our allies and partners, because, again, on January 21, the war in Ukraine doesn't just go away," Sullivan told Karl.

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