Secret Service has launched an investigation after Donald Trump’s ex-butler, Anthony Senecal, called for the death of President Barack Obama.

In a Facebook post, Anthony Senecal wrote that Barack Obama “should have been taken out by our military and shot as an enemy agent in his first term”.

Anthony Senecal worked for Donald Trump, the presumptive Republican nominee for president, for nearly 30 years.

However, the Trump campaign quickly disavowed Anthony Senecal’s remarks, saying: “He is not employed by Mr. Trump, and hasn’t been since June of 2009.”

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Donald Trump campaign spokeswoman Hope Hicks added in a statement: “We strongly condemn these horrible comments from Mr. Senecal.”

Anthony Senecal’s post, which was not public, was first reported by Mother Jones, but he later confirmed its authenticity to several news organizations.

On May 12, Anthony Senecal, 84, told CNN that President Barack Obama should be “hung” outside the White House. He also called the White House the “White Mosque”.

The New York Times profiled Anthony Senecal in March, saying despite retiring in 2009 he has stayed at Donald Trump’s Mar-a-Lago estate in Florida as “a kind of unofficial historian”.

According to the publication, Anthony Senecal “understands Mr. Trump’s sleeping patterns and how he likes his steak (“It would rock on the plate, it was so well done”), and how Mr. Trump insists – despite the hair salon on the premises – on doing his own hair”.