Ignore a Subpoena?

MLB said [Union Chief] Fehr and [MLB VP] Manfred would testify voluntarily "despite serious legal concerns" but that players "will respectfully decline the invitations to testify".

In a rare show of unity over the steroids scandal that has battered the sport over the last year, the players and owners said they would fight the subpoenas, which are far more than simple "invitations" to attend.

>> Reuters

"Respectfully deline" to testify when you are told that you have to? I know if I was ever in such a situation I would not be able to get away with "respectfully declining". "Respectfully Decline" translates to: "Blow it out your ass!"