The former White House ethics lawyer to President George W. Bush on Thursday mocked the former national security adviser to President Trump, Michael Flynn, following reports that he is seeking immunity in exchange for a testimony in Russia investigations.

Richard Painter, who was the chief White House ethics lawyer for Bush from 2005 to 2007, jokingly tweeted: "Renaming my kids' pet canary bird General Flynn."

Renaming my kids' pet canary bird General Flynn. — Richard W. Painter (@RWPUSA) March 31, 2017

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Flynn reportedly told the FBI that he is willing to testify about the Trump campaign's potential ties to Russia in exchange for immunity from prosecution.

The phrase "sing like a canary" is often used to refer to someone who unloads information about a wrongdoing on authorities.

Flynn resigned in February, after it was revealed that he misled White House staff on his interactions with Russia's ambassador to the U.S., Sergey Kislyak, and had discussed sanctions with Kislyak ahead of Trump's inauguration.