Liberal MP Christopher Pyne has received an apology from the ABC -- the national broadcaster's second Pyne mea culpa -- after an offensive tweet was broadcast during his appearance last night on Q&A.

Pyne engaged lawyers last year after a Marieke Hardy piece published on ABC opinion website The Drum said many people wanted to see the shadow minister attacked by a "large, libidinous dog". Now, Pyne may have another case after an errant tweet on last night's Q&A program.