The Texas Freedom Caucus’ threatening letter to Sidley Austin over the firm’s abortion health care benefits may have failed to strike fear into the hearts of Big Law managing partners, but they know that its basis—the reversal of Roe v. Wade—has the potential to divide firms along deeply held ideological lines.

Almost no law firm has unanimity on the issue of abortion, said the managing partner of a Houston law firm who asked not to be identified because his firm has also pledged to continue health benefits for out-of-state abortions.