The heads of the House Judiciary Committee are threatening to subpoena the Obama administration for access to its legal justification for killing suspected terrorists who are U.S. citizens.

In a letter to President Obama on Wednesday, committee Chairman Bob Goodlatte (R-Va.) and ranking member John Conyers (D-Mich.) demanded that plans to view the documents be finalized by Thursday evening or they will issue a subpoena.

The move comes more than two months since the panel first requested access to the detailed Office of Legal Counsel (OLC) memos, which lay out the administration’s legal support for targeting U.S. citizens who are suspected of being terrorists, pose an “imminent threat” to U.S. national security and for whom capture is not an option.