Did the world's most dangerous and most wanted drug lord just put a bounty on the head of Republican presidential frontrunner Donald Trump?

Several websites have reported that notorious drug kingpin Joaquin "El Chapo" Guzman is offering US $100 million to deliver the controversial billionaire to him, dead or alive.

What prompted "El Chapo" to dangle a reward for Trump's capture? The drug trafficker is supposedly still infuriated by the Republican presidential candidate's harsh remarks against Mexicans.

"He was mad. He wants Donald Trump dead and will pay any amount of money to have Donald Trump's head," said an unnamed inmate close to "El Chapo," according to a report that came out in Most Extreme News.

Trump earlier drew flak after he accused Mexican immigrants of "bringing drugs" and "bringing crime" to the United States. He also called Mexican immigrants "rapists" and guilty of "killing US on trade."

"El Chapo," for his part, has always been a vocal critic of Trump. After his escape from a high security prison in July, a person with an unconfirmed Twitter account believed to be connected with the drug lord has been issuing threats against the real estate mogul.

In the Twitter account believed to be administered by Guzman's son Ivan, the infamous drug trafficker wrote in Spanish, apparently referring to Trump: "Keep f... around and I'm gonna make you swallow your b...ch words you f... whitey milk-s...."

A former New York City Police Department commissioner warned Trump not take the purported threat lightly. "Any time you're threatened by anyone, it's a reason for concern," Bernard Kerik told Newsmax. "This guy is a known killer. (...) He's involved in one of the largest drug cartels in the world," he added.

Even famous Latin American rapper Pitbull supposedly warned Trump to be careful of "El Chapo."

The drug lord's open threats, however, did not deter the leading Republican presidential hopeful from campaigning.

He nevertheless beefed up his security, wore a bulletproof vest during sorties, and discreetly asked the Federal Bureau of Investigation to look into El Chapo's threats.

"Law enforcement is working very hard right now on the situation here," Trump said, referring to the FBI's investigation.