The House Judiciary Committee’s Republican majority is demanding documents from the Federal Trade Commission regarding what they call the agency’s “unusual approach” in opposing the Illumina-Grail merger.

Judiciary Committee Chair Jim Jordan, R-Ohio, sent a letter to FTC Chair Lina Khan on Thursday claiming the agency improperly shared information with the European Commission that led the foreign regulators to deny the proposed acquisition of Grail, a maker of cancer diagnostic tests, by Illumina, a biotechnology company.