The Democratic Labour Party has written to the Palmer United Party scotching talk of joint legal action against defectors John Madigan and Glenn Lazarus.

The Palmer United Party issued a media statement earlier this month saying it had "commenced discussions" with the DLP over launching joint High Court action against former DLP senator John Madigan and former PUP senator Glenn Lazarus.

Palmer United Party leader Clive Palmer. Credit:Alex Ellinghausen

But a letter obtained by Fairfax Media shows the DLP federal secretary Michael Byrne wrote to PUP leader Clive Palmer the next day, telling him no such legal action exists or is likely to occur.

"I advise that no such case, nor has its likelihood ever been discussed at the federal executive," Mr Byrne wrote.