A joint statement from Monahan and the PGA Tour Policy Board said day-to-day operations will be led in his absence by CEO Ron Price and president Tyler Dennis.

"The Board fully supports Jay and appreciates everyone respecting his privacy," Tuesday's statement read.

"We will provide further updates as appropriate."

The statement did not specify the nature of the medical issue.

The news adds to an already tumultuous week for the 53-year-old Monahan.

The PGA Tour, DP World Tour and LIV Golf rocked the sport on June 6 when they announced an agreement to merge into a single, for-profit entity.

The move caught much of the golf world off-guard, including the Tour players, who were not consulted before the deal was made.

When Monahan met with players behind closed doors following the announcement, many directed their ire at Monahan, some reportedly calling for him to step down as commissioner.

On Monday, a U.S Senate subcommittee sent letters to Monahan and LIV's Greg Norman asking to see documents, emails and other records having to do with merger.

The subcommittee is investigating the deal, which also involves the Saudi Arabian Public Investment Fund (PIF), which bankrolls LIV Golf.

That investigation opened days after Monahan sent a letter to the Senate, placing some of the blame for the merger at the feet of the politicians.

"While we are grateful for the written declarations of support we received from certain (congressional) members," the letter read, "we were largely left on our own to fend off the attacks, ostensibly due to the United States' complex geopolitical alliance with the Kingdom of Saudi Arabia.”

"This left the very real prospect of another decade of expensive and distracting litigation and the PGA Tour's long-term existence under threat."

Monahan took over as Tour commissioner in January 2017, replacing Tim Finchem, who retired after 23 years in the post.