"The emails were discovered in recent weeks by Mr. Kushner’s legal team"

The emails were discovered in recent weeks by Mr. Kushner’s legal team as it reviewed documents, and the team amended his clearance forms to disclose it, according to people briefed on the developments, who like others declined to be identified because of the sensitive political and legal issues involved…

The strain, though, exists on both sides. Mr. Kasowitz and his colleagues have been deeply frustrated by the president. And they have complained that Mr. Kushner has been whispering in the president’s ear about the Russia investigations and stories while keeping the lawyers out of the loop, according to another person familiar with the legal team. But one person familiar with Mr. Kasowitz’s thinking said his concerns did not relate to Mr. Kushner.

The president’s lawyers view Mr. Kushner as an obstacle and a freelancer more concerned about protecting himself than his father-in-law, the person said. While no ultimatum has been delivered, the lawyers have told colleagues that they cannot keep operating that way, raising the prospect that Mr. Kasowitz may resign.