UPDATE: 7:48 p.m. EDT -- The U.S. Secret Service has launched an investigation into Facebook posts about President Barack Obama allegedly done by a former butler of presumptive Republican presidential nominee Donald Trump, Reuters reported.

The alleged posts by the former butler, identified as Anthony Senecal, 74, were first reported in Mother Jones magazine.

Original story:

Donald Trump's longtime former butler hates President Barack Obama and thinks he should be killed, according to recent social media rants teeming with profanity and exclamation points. 

Anthony Senecal, who worked as Trump's butler for 17 years and was named the in-house historian at the business mogul's Mar-a-Lago estate in Palm Beach, Florida, has touted his close relationship with his former boss in media interviews. But Senecal feels very differently about the nation's first black president, according to Mother Jones magazine, which on Thursday posted some of his social media rants. Read them here

Senecal confirmed the authenticity of the posts to Mother Jones. "I wrote that. I believe that," he said. A spokeswoman for the Trump campaign told Mother Jones that Senecal had not worked at Mar-a-Lago "for many years."

One of the Facebook posts reads: "To all my friends on FB, just a short note to you on our pus headed "president" !!!! This character who I refer to as zero (0) should have been taken out by our military and shot as an enemy agent in his first term !!!!! Instead he still remains in office doing every thing he can to gut the America we all know and love !!!!! Now comes Donald J Trump to put an end to the corruption in government !!!! The so-called elite, who are nothing but common dog turds from your front lawn are shaking in their boots because there is a new Sheriff coming to town, and the end to their corruption of the American people (YOU) is at hand !!!! I cannot believe that a common murder is even allowed to run (killery clinton) OR that a commie like bernie is a also allowed to also run !!!! Come on America put your big boy pants on---this election you have a choice---GET YOUR ASS OUT AND VOTE !!!! Thank you !!!!"

Senecal's favorite insult seems to be calling Obama "zero," and he has repeatedly suggested the president be put to death. Senecal wrote on April 21, 2015: "Looks like that sleezey [sic] b------ zero (O) is trying to out maneuver Congress again, if the truth be known this prick needs to be hung for treason!!!

He wrote on May 23, 2015: "I feel it is time for the SECOND AMERICAN REVOLUTION !!!!! The only way we will change this crooked government is to douche it !!!!! This might be the time with this Kenyan fraud in power !!!!! ...[W]ith the last breath I draw I will help rid this America of the scum infested in its government--and if that means dragging that ball less **** head from the white mosque and hanging his scrawny ass from the portico--count me in !!!!!" [Note: We edited out the curse word. Senecal did not.]

Senecal was unapologetic when asked to explain his heated words. "I cannot stand the bastard," he told Mother Jones. "I don't believe he's an American citizen. I think he's a fraudulent piece of crap that was brought in by the Democrats."

The New York Times profiled Senecal in March, noting the longtime servant, "understands Mr. Trump's sleeping patterns and how he likes his steak." In the article, Senecal described his boss' generosity, such as giving $100 bills to the groundskeepers.

“You’re a Hispanic, and you’re in here trimming the trees and everything, and a guy walks up and hands you a hundred dollars,” Senecal told the New York Times. “And they love him, not for that, they just love him.”

Senecal seems certain his former boss will do a better job than Obama. He wrote on June 16, 2015 on Facebook: "Today, my employer and friend Donald J Trump announced he was running for the Office of President of the United States... NO ONE deserves to run for and be elected to this GREAT office, than Mr. Trump. !!!!!"