Sex scandals are rocking America and even a former president has been caught up in the web.

On Thursday, former US President George HW Bush issued an apology to actress Heather Lind after she accused him of groping her (touching her bum bum) at an event to promote a TV series.

34-year-old Lind said the incident occurred four years ago at an event to promote the TV series "Turn: Washington's Spies," according to the Daily Mail, which saved a screenshot of a lengthy Instagram post she wrote and later deleted.

It is the latest in an outpouring of sexual harassment allegations against powerful men in entertainment, fashion and finance that followed the downfall of movie mogul Harvey Weinstein, who stands accused of assaulting and raping actresses.

Lind added she decided to share her story after seeing Bush Sr, 93, appear onstage at a benefit concert to raise money for victims of the hurricane-ravaged southern United States and Caribbean.

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"I found it disturbing because I recognize the respect ex-presidents are given for having served," she wrote.

"But when I got the chance to meet George H. W. Bush four years ago to promote a historical television show I was working on, he sexually assaulted me while I was posing for a similar photo.

"He didn't shake my hand. He touched me from behind from his wheelchair with his wife Barbara Bush by his side. He told me a dirty joke,' she added.

Later, as pictures were being taken, Bush repeated the act, while "Barbara rolled her eyes as if to say, 'not again.'"

A Bush spokesman has however apologized to Lind.

The spokesman called the former president's misbehavior as "attempt at humor."

"President Bush has been confined to a wheelchair for roughly five years, so his arm falls on the lower waist of people with whom he takes pictures," a statement from Bush's office read.

"To try to put people at ease, the president routinely tells the same joke -- and on occasion, he has patted women's rears in what he intended to be a good-natured manner.

"Some have seen it as innocent; others clearly view it as inappropriate. To anyone he has offended, President Bush apologizes most sincerely," the statement added.

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