In a previously unreported Jan. 11 letter, the four key defense spending chiefs in Congress — Senate Appropriations Defense Subcommittee Chair Jon Tester (D-Mont.), ranking member Susan Collins (R-Maine), House Appropriations Defense Subcommittee Chair Ken Calvert (R-Calif.) and ranking member Betty McCollum (D-Minn.) — wrote a sharp reminder to Biden that the CHIPS Act had a “national security cornerstone,” one that Secure Enclave was meant to fulfill.