Few members of Mr. Trump’s team were more skeptical of Mr. Flynn than the vice president, numerous administration officials said. Mr. Pence, who used the false information provided by Mr. Flynn to defend him in a series of television appearances, was incensed at Mr. Flynn’s lack of contrition for repeatedly embarrassing him by withholding the information, according to three administration officials familiar with the situation.
Mr. Flynn and Mr. Pence spoke twice in the past few days about the matter, but administration officials said that rather than fully apologize and accept responsibility, the national security adviser blamed his faulty memory — which irked the typically slow-to-anger Mr. Pence.
The slight was compounded by an episode late last year when Mr. Pence went on television to deny that Mr. Flynn’s son, who had posted conspiracy theories about Hillary Clinton on social media, had been given a security clearance by the transition team. The younger Mr. Flynn had, indeed, been given such a clearance, even though his father had told Mr. Pence’s team that he had not.
Officials said classified information did not appear to have been discussed during the conversation between Mr. Flynn and the ambassador, which would have been a crime. The call was captured on a routine wiretap of diplomats’ calls, the officials said.
But current Trump administration officials and former Obama administration officials said that Mr. Flynn did appear to be reassuring the ambassador that Mr. Trump would adopt a more accommodating tone on Russia once in office.
Former and current administration officials said that Mr. Flynn urged Russia not to retaliate against any sanctions because an overreaction would make any future cooperation more complicated. He never explicitly promised sanctions relief, one former official said, but he appeared to leave the impression that it would be possible.