Former New York mayor Rudy Giuliani (Damian Dovarganes/Associated Press)

Through a particularly nasty tweet sent Wednesday morning, Dinesh D’Souza once again proved that he excels at being a race-baiting political provocateur who hates President Obama. By Wednesday evening, Rudy Giuliani once again proved that D’Souza’s long-held and wrong-headed suspicions of the president are firmly rooted among right-wing Republicans.

With Wisconsin Gov. Scott Walker (R) in attendance at a dinner at the 21 Club in Manhattan, the former New York mayor baldly questioned Obama’s patriotism. “I do not believe, and I know this is a horrible thing to say, but I do not believe that the president loves America,” Giuliani said, according to a story in Politico. “He doesn’t love you. And he doesn’t love me. He wasn’t brought up the way you were brought up and I was brought up through love of this country.” This folderol is courtesy of D’Souza.

In a 2010 Forbes piece headlined “How Obama thinks,” the rumored philanderer currently serving five years of probation for campaign finance violations wrote that the president’s worldview was inherited from his father. “[T]o his son, the elder Obama represented a great and noble cause, the cause of anticolonialism,” D’Souza scribbled. “From a very young age and through his formative years, Obama learned to see America as a force for global domination and destruction. He came to view America’s military as an instrument of neocolonial occupation,” he later added. “Obama grew to perceive the rich as an oppressive class, a kind of neocolonial power within America….For Obama, the solutions are simple. He must work to wring the neocolonialism out of America and the West.”

So noxious was D’Souza’s argument that David Frum, the neoconservative commentator and senior editor at the Atlantic who served as a speechwriter to President George W. Bush, criticized the author and the magazine that published the screed when he ran his own blog.

Nothing more offends conservatives than liberal accusations of racial animus. Yet here is racial animus, unconcealed and unapologetic, and it is seized by savvy editors and an ambitious politician as just the material to please a conservative audience. That’s an insult to every conservative in America.

The ambitious politician Frum refers to is Newt Gingrich, who also parroted D’Souza’s nonsense in a September 2010 interview with the National Journal that can no longer be found online. That Giuliani is spouting the same nonsense unchallenged nearly five years later says as much about him as it does about the Republican Party. Don’t dismiss Giuliani’s questioning the president’s patriotism because he is an unaccountable private citizen. Have a listen to what Rep. Scott Perry (R-Pa.) said about Obama’s request for authorization to use military force against the Islamic State during a panel discussion last week. Keep in mind that Perry is a member of the House Foreign Affairs Committee and oversight chairman of the Homeland Security Committee.

The conundrum for people like you, people like me and people out in the homeland that feel the same way is that we feel duty bound to do something…..We have a commander in chief who seems not only not ready, not unwilling, but really working collaboratively with what I would say is the enemy of freedom and of individual freedom and liberty and Western civilization and modernity. And in that context, how do you vote to give this commander-in-chief the authority and power to take action when…you know in your heart that, if past performance is any indicator of future performance, that he won’t, and that he actually might use it to further their cause and what seems to be his cause and just drag you as a complicitor in it.

Perry later backed off his treasonous assertion against Obama, saying, “Of course he isn’t collaborating with our enemies.” Yeah, okay.

Perry, Giuliani, D’Souza and countless others are part of a larger problem in American political discourse: the constant questioning of whether Obama not only loves this country, but also whether he would do everything in his power to protect it. Those engaging in this destructive discussion are the ones who “don’t love America.”

Follow Jonathan on Twitter: @Capehartj