Remember when Rudy Giuliani was dubbed "America's Mayor," a salute to his actions in the days and weeks following the attacks of 9/11? Well, New York City is now led by a man who is absolutely unworthy of that office.

That was made crystal clear last summer when Mayor Bill de Blasio convened a City Hall "discussion" about policing. On his immediate right that day was highly-respected Police Commissioner William Bratton. And on his left (literally, because it's hard to get to de Blasio's left ideologically) sat Al Sharpton. In other words, Mayor de Blasio gave equal billing to a man who had helped save thousands of lives and a racial arsonist.

Bill Bratton arrived in New York City in 1990 to take over the city's Transit Police. That same year, more than 2,200 people were murdered in the city, most of them young, black, and male. Last year there were 335 homicides, an astounding 85% drop from the bad old days. The decline was certainly not the work of one man, but Bratton - who ran the entire NYPD in the mid 90s - unquestionably played a big role.

Then there's Sharpton, who was compiling a vastly different resume in the early 90s, when he referred to "Socrates and them Greek homos" and called Jews "diamond merchants." Beginning with the Tawana Brawley hoax, his words sparked mayhem and implicitly led to deaths (Crown Heights, Freddie's Fashion Mart), although it was never Sharpton himself who twisted the knife or lit the match.

Back to City Hall this past summer. Referring to Mayor de Blasio's multi-racial son, Sharpton said this: "If Dante wasn't your son, he'd be a candidate for a chokehold." Did the mayor take offense when this racial agitator characterized New York cops as racists? No, de Blasio put his tail between his legs and meekly uttered, "I take Rev. Sharpton's admonition to heart." Following that disgusting display of kowtowing, Mayor de Blasio has since invoked Dante's name numerous times himself, always to imply that New York cops are the bad guys.

But of course, the anti-cop vitriol reached a crescendo this month when protesters shut down parts of New York after the grand jury ruling in the Eric Garner case. The mayor endorsed the protests and looked the other way when hundreds of marchers screamed the ugliest chant in recent memory: "What do we want? Dead cops! When do we want 'em? Now!"

As he finishes his first year in office, Mayor Bill de Blasio has never lifted a finger to defend his police department or its 34,000 men and women, whose morale has sunk even faster than the city's crime rate. Meanwhile, his "co-mayor" Al Sharpton has been leading protest marches against "police violence" and "police misconduct" and "police brutality." In Al's world, the police are always at fault.

Despite all that, one thing should be clear: In last weekend's assassination of NYPD officers Wenjian Liu and Rafael Ramos, neither Al Sharpton nor Bill de Blasio has "blood on his hands." The guilty one is Ismaaiyl Brinsley, the 28-year-old psychopath who pulled the trigger. But with their incessant anti-police rhetoric, the mayor and his preacher may have encouraged a madman to pick up a gun and hunt down some cops.

There are many reasons Bill de Blasio should not be mayor of America's greatest city. He is a far-left, income-redistribution, pro-teacher union, eat-the-rich kind of guy. But all that takes a back seat to the fact that de Blasio has, literally and figuratively, embraced the despicable Al Sharpton. That alone makes him ineligible to lead the city and its police force.

Throughout his life the mayor has gone by various legal names - Warren Wilhelm, Jr. by birth, then Warren de Blasio-Wilhelm, and finally Bill de Blasio. Whichever name he prefers is of course up to him. But for the good of the city and its people, a prefix should be added: Former Mayor of New York City. Bill de Blasio, by any name, is a total disgrace. He should resign!