New York, New York - A group representing victims’ families and survivors of the 2001 terrorist attacks in the United States have accused the high-profile American golfers in the LIV Golf Series of sportswashing and betraying their country.

In a letter sent to the agents of Phil Mickelson, Dustin Johnson, Bryson DeChambeau, Patrick Reed, and Kevin Na, 911familiesunited.org expressed their outrage at the players for competing in the Saudi-backed events.

"As you may know, Osama bin Laden and 15 of the 19 September 11 hijackers were Saudis," wrote the organization’s national chair Terry Strada, a mother of three whose husband, Tom, was on the 104th floor of the north tower of the World Trade Center during the attacks.

"It was the Saudis who cultivated and spread the evil, hate-filled Islamist ideology that inspired the violent jihadists to carry out the deadly 9/11 attacks."

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"And, most egregiously, it is the Kingdom that has spent 20 years in denial: lying about their activities, and cowardly dodging the responsibility they bear. Yet these are your partners, and much to our disappointment, you appear pleased to be in business with them."

"Please, do not insult our loved ones’ memories and take the pathetic position, as one of your foreign colleagues did last week, claiming you are 'just golfers playing a game' or blandly treating the evils of the Saudi regime as 'human rights' concerns."

"You are all Americans, keenly aware of the death and destruction of September 11. Whether it was the appeal of millions of dollars of hard cash, or just the opportunity to prosecute your professional grievances with the PGA, you have sold us out."

"This is a betrayal not only of us, but of all your countrymen."

Former Masters champion Patrick Reed and world number 168 Pat Perez became the latest players to join LIV Golf on Saturday.

Reed became the 19th PGA Tour member to sign with the breakaway circuit, just as 17 big names competing in the first $25 million event this week were suspended by the Tour as soon as play started at Centurion Club on Thursday.

PGA Tour commissioner Jay Monahan said the "same fate holds true" for any players who compete in future LIV events, with Reed, Bryson DeChambeau – who lost a sponsorship deal over his participation – and now Perez set to contest the second event in Portland at the end of the month.

"I’m super excited," Reed said. "Just the thought of being able to be part of an evolution and a change in golf for the better is unbelievable."

"I’ve been talking to some of the guys after the first and second rounds and they told me how well the tournament is run and the turnout with the fans, the energy and excitement. Portland can’t get here fast enough."

On the course, former Masters champion Charl Schwartzel secured an incredible $4.75 million payday with victory in both the individual and team events.