Graeme McDowell said that USGA executive director Mike Davis told him research shows that long putters have an advantage, according to the Herald Sun, an Australian newspaper.
"They're convinced the research has shown that under pressure on a Sunday afternoon the long putter just kind of takes one extraneous movement out of the putting stroke," McDowell said at Kingston Heath.
"I think it's probably something they're disappointed in themselves that it's got to this point. They probably should have nipped it in the bud many, many years ago."
Ian Poulter, who is in Australia with McDowell for the Australian Masters, agreed.
"Ban it. End of story," the Englishman said. "I mean, don't anchor the butt end of the club. It's simple, right?"
The possibility of a ban on long putters and belly putters has divided professional golf. Tiger Woods has already gone on record supporting the ban, Phil Mickelson spoke out against the ban, and Keegan Bradley said he would consider legal action if the USGA and R&A decided to outlaw the anchored putter.