Two Secret Service officers are being investigated for allegedly taking a picture with Donald Trump's grandson while he was sleeping.

The alleged incident took place last weekend while the agents were driving eight-year-old Donald Trump III from the family estate in Westchester, New York, back into Manhattan, Mother Jones reports.

Trump III, Donald Jr and Vanessa Trump's son, woke up as the agents were snapping selfies and was 'freaked out'.

Trump III (pictured with his parents and sister, Kai, in a government car) was being driven home to Manhattan when the officers allegedly took selfies with him while he was sleeping

The youngster told his mom about the alleged incident as soon as he got home, and she then reported it to his father.

It was quickly being discussed by those at the very top of the Secret Service, and the two agents in question have since been summoned to front the Secret Service Office of Professional Responsibility in DC.

The agency released a statement about the incident on Wednesday.

The moment he got home to Manhattan he told his mom, who then passed the information along to Trump Jr - kicking off the investigation, the website reports.

Donald Trump III poses for a picture with his grandfather on November 11 after a television interview

The two agents who were accused of taking selfies with Trump III (pictured on Inauguration Day with his family as a guard and police officer look on) have been summoned to explain themselves to the Secret Service Office of Professional Responsibility in DC

'The US Secret Service is aware of a matter involving two of our agents and one of our protectees,' a spokesman said.

'Our Office of Professional Responsibility will always thoroughly review a matter to determine the facts and to ensure proper, long-standing protocols and procedures are followed.

'The Secret Service would caution individuals to not jump to conclusions that may grossly mischaracterize the matter.'