CNN was apparently irked enough at a joke made by President Barack Obama about one of its reporters that the network brought up the issue with the White House Monday."One of President Obama's more cutting jokes was at CNN," CNN anchor Michelle Kosinski asked White House spokesman Josh Earnest, referencing the president's speech at the White House Correspondents' Dinner. "Was he saying that he doesn't …"Earnest cut in, saying, "Don't tell me you guys got all sensitive. It's all in good fun."A smiling Kosinski then asked, "He doesn't think that CNN has a problem journalistically?""He doesn't," replied Earnest.The back and forth was in response to a comment Obama made at Saturday's event, which typically involves the president roasting members of the media and other politicians."I won't lie — look, this is a tough transition. It's hard. Key staff are now starting to leave the White House. Even reporters have left me," Obama said. "Savannah Guthrie, she's left the White House press corps to host the "Today" show. Norah O'Donnell left the briefing room to host CBS' "This Morning." Jake Tapper left journalism to join CNN."