John Bolton lawyer tells judge his interests do not align with WH chief of staff Mick Mulvaney
Composite image of John Bolton and Mick Mulvaney, photos by Gage Skidmore.

Former National Security Advisor John Bolton told a federal judge on Monday that his interests do not align with those of acting White House chief of staff Mick Mulvaney.

"A long-simmering feud within the White House broke into the open on Monday as a lawyer for John R. Bolton, President Trump’s former national security adviser, filed a motion trying to keep Mick Mulvaney, the president’s acting chief of staff, from joining a lawsuit over impeachment testimony," New York Times chief White House correspondent Peter Baker reported Monday.

The lawsuit was filed by former Deputy National Security Advisor Charles Kupperman, who asked a judge to decide whether he should abide by a congressional subpoena or obey Trump's edict to stonewall Congress.

"Mr. Bolton’s lawyer argued in court papers that Mr. Mulvaney should not be allowed to jump into the existing lawsuit as a plaintiff because his interests are significantly different," The Times reported. "But the legal schism underscored a broader rift between Mr. Mulvaney, who facilitated Mr. Trump’s effort to pressure Ukraine for damaging information about Democrats, and Mr. Bolton, who tried to resist it."

Bolton and Kupperman were both reportedly "flabbergasted" that Mulvaney attempted to join the lawsuit.

Watch Peter Baker discuss his story on MSNBC's "Deadline: White House" with Nicolle Wallace:

UPDATE: Mulvaney withdrew his motion.