Emails discovered by the FBI and police reveal Farook’s wife, Pakistani native Tashfeen Malik, objected to the Christmas setting and was upset her husband had to attend.

Just before the attack, Farook had posed with four fellow county employees in front of a Christmas tree in the conference room.

A short time later, 14 people were killed and 22 others injured when Farook and his wife opened fire at the meeting with assault rifles.

“She had essentially made the statement in an online account that she didn’t think that a Muslim should have to participate in a non-Muslim holiday or event,” said San Bernardino police chief Jarrod Burguan in an exclusive interview with ABC News, that aired on the ABC News program Nightline.