Justice Department officials have had numerous conversations with White House lawyers about the conclusions made by Mr. Mueller, the special counsel, in recent days, according to people with knowledge of the discussions. The talks have aided the president’s legal team as it prepares a rebuttal to the report and strategizes for the coming public war over its findings.

A sense of paranoia was taking hold among some of Mr. Trump’s aides, some of whom fear his backlash more than the findings themselves, the people said. The report might make clear which of Mr. Trump’s current and former advisers spoke to the special counsel, how much they said and how much damage they did to the president — providing a kind of road map for retaliation.