"We are deeply troubled by the news reports that Bannon, with the evident support of his cohort at Brietbart News, is urging the president to take action against Robert Mueller", the three attorneys write.
The disclosures follow the indictments this week of Manafort and his longtime business partner and Trump campaign deputy, Rick Gates.
The charges relate to an alleged transaction of money the pair are reported to have received from a former president of Ukraine.
Trump reportedly complained to ousted White House Chief Strategist Steve Bannon on the phone yesterday that Kushner convinced him to fire disgraced National Security Advisor Michael Flynn and followed up that request by asking him to fire former FBI Director James Comey.
The publication is reporting Trump is "apoplectic" as his allies share growing fears of impeachment. The White House declined to comment.
Bannon, back at his old role as the head of conservative news site Breitbart, has reportedly advised the president to shake up his legal team and do all he can to pressure Congress to defund Mueller's investigation, sources told Vanity Fair.
The firing of Comey directly resulted in Mueller's appointment.
Kushner attended the June 2016 meeting at Trump Tower between top Trump campaign officials and a cadre of Russian figures, including some with links to the Kremlin. It is not clear how Kushner's advice to the President might relate to the overall Russian Federation investigation or potential obstruction of justice.
Given how many meetings that Kushner and now-indicted Paul Manafort participated in together, Trump's frustration with his son-in-law is likely just beginning to emerge, and should Kushner get wrapped up in Robert Mueller's probe, all this behind-the-scenes sniping is likely to spill out into the open, given both the Trump and Kushner family histories. They believe that Mueller's history with the federal investigation body will make it very hard for him to undertake a fair investigation of its involvement in this political drama with Russian Federation.
That report said that Ivanka and Jared would try to stick around in Washington through the end of the 2018 school year, but they could bail sooner.
Trump, instead, agreed, an unnamed source familiar with the conversation told Vanity Fair.