Anchored by Jake Tapper, The Lead airs at 4 p.m. ET on CNN.
The latest on national protests. Plus, what went wrong in Yemen rescue attempt?
By CNN Chief Washington Correspondent Jake Tapper
(CNN) – An unusually harsh and personal war of words erupted on Sunday, even for the current hyper-partisan atmosphere in Washington, D.C., with one of President Barack Obama's top advisers bringing up the 40-year-old criminal record of the Republican congressman leading the investigation into alleged IRS abuses.
"Strong words from Mr Grand Theft Auto and suspected arsonist/insurance swindler," tweeted David Plouffe, the political guru (and unofficial adviser) for Obama, referring to the chairman of the House Government Reform and Oversight Committee, Rep. Darrell Issa, R-Calif.
"And loose ethically today," Plouffe ended his tweet, linking to a story about Issa answering questions on CNN's “State of the Union” with Candy Crowley about the controversy over IRS staffers targeting conservative groups for scrutiny, in which Issa referred to White House press secretary Jay Carney as a "paid liar."
Asked for a response to Plouffe's tweet, Issa's spokesman Frederick Hill told CNN, "Looks like the Chairman hit a nerve today. Hopefully President Obama follows Plouffe on Twitter and may finally see some information from a senior advisor about what's going on at the IRS."
According to a source close to Issa, the congressman thought Plouffe's tweet about allegations against him from 1972 and 1982 particularly below the belt, given that "Rep. Issa has never used his position to investigate President Obama for things before he took office like his land deal with convicted felon Tony Rezko."
Issa using the "L" word – liar – is unusual in a town where pols and members of the media regularly dance around such a direct accusation, preferring words that allow for the possibility of misspeaking or misleading, but not deliberately speaking an untruth. Plouffe's reference to charges and suspicions against Issa from a generation and two generations ago is also unusual in a city where such mentions are considered gauche and uncollegial. (Take, as but two examples, those whose careers managed quite well despite Chappaquiddick and Iran-Contra.)