ABC's Jake Tapper announced last night that this Sunday's edition of This Week will feature two guests to talk about the failed car bombing in Times Square -- Attorney General Eric Holder and former New York City mayor Rudy Giuliani.

I can understand the temptation to invite Giuliani on to discuss the attempted attack. After all, he was the mayor of the city that was threatened, and he was once a U.S. attorney and a member of the Justice Department.

But let's be honest, Giuliani isn't exactly credible when it comes to terrorism and national security.

Tapper offered a preview of what he and Rudy will discuss:

And, in a This Week EXCLUSIVE interview, former New York Mayor Rudy Giuliani explains why he thinks the accused bomb suspect should be declared an enemy combatant. Should terror suspects lose their Miranda rights and be stripped of their citizenship? Is a criminal approach to terrorism making America less safe?

We already know the answers to these questions. Giuliani will say that the Obama administration is making a mistake by treating terrorism as a law enforcement issue and that this reflects a “pre-9-11 approach” to terrorism and something else about 9-11 and 9-11 and 9-11. Of course, this is the complete opposite of what Giuliani said during the Bush years, when he praised successful criminal prosecutions of terrorism suspects.

And let's not forget that he caused quite a stir a few months ago with the gobsmackingly dishonest claim that there were “no domestic attacks” during the Bush administration.

Put simply, Giuliani's approach to terrorism isn't guided by principle or sense or even basic facts -- it's guided by politics. He completely reversed his position on criminal prosecution of terrorists -- the very issue Tapper will discuss with him -- based solely on which party controlled the White House. He's demonstrated more times than should be necessary that you can't trust what he says.

And yet he'll be on ABC this Sunday for an “EXCLUSIVE interview,” offered yet another platform to lie and spin about an issue on which he has zero credibility.