Democratic U.S. Senator Richard Blumenthal, who chairs the Permanent Subcommittee on Investigations, and the panel's top Republican Ron Johnson invited them to appear.
A PGA Tour spokesman said the Tour looks "forward to appearing before the Senate subcommittee to answer their questions about the framework agreement" but did not specify if Monahan would appear. Last week, Democratic Senators Elizabeth Warren and Ron Wyden asked the Justice Department to open an antitrust investigation into the planned deal, saying they believe it would result in a monopoly over professional golf operations.
The PGA Tour, DP World Tour and rival Saudi-backed LIV circuit, which had been involved in a bitter fight that split the sport, announced an agreement to merge and form one unified commercial entity.