Rep. Ben Ray Luján — like many in Congress — wants President Donald Trump to release his tax returns.

Transparency, the New Mexico Democrat said recently in a Facebook post, “is a cornerstone of democracy.”

But he doesn’t want to release his own tax returns. And that puts him in good company on both sides of the aisle.

Roll Call sent a request to all of the nation’s senators and representatives — more than 500 in all — to release their tax returns. Only 37 responded, and of those, six provided the documents.

The written requests were sent at least three times over a period of several weeks, starting in April, to each lawmaker and key staff members.