The Justice Department has warned the PGA Tour that it plans to investigate its merger with the Saudi-backed tour LIV Golf over antitrust concerns, sources with knowledge of the matter told the Wall Street Journal.

A DOJ probe could jeopardize and threaten to significantly delay the partnership, which PGA Tour Commissioner Jay Monahan called “transformational” earlier this month.

When the agreement was announced, the parties were set to combine their commercial businesses and rights into a new entity. LIV Golf Investments, the firm spearheading the LIV tour, is backed by the Saudi government’s sovereign wealth fund. Over the last year, LIV and the PGA have been entangled in multiple antitrust lawsuits. Golfers and fans who favored the PGA slammed the LIV as a so-called “sports-washing” vehicle for the authoritarian Saudi regime to distract from its extensive record of human-rights abuses.