After a nearly two-year legal battle to get congressional testimony from a former White House counsel, lawmakers are now wrestling with how to better enforce their subpoenas.

That issue was the topic of a hearing Tuesday before a House Judiciary subcommittee on the courts, as members peppered lawyers—including a former House general counsel—with questions about how to improve the process, and what legislation they might consider in the future. Rep. Hank Johnson, the chairman of the subcommittee, and Rep. Darrell Issa, the panel’s top Republican, both indicated an interest in pursuing legislation addressing the topic.