A Tennessee man claims President Barack Obama's marriage equality endorsement drove him to erect a billboard calling gay sex an “abomination.”

The billboard quotes a verse from Leviticus 18: “You shall not lie with a man as with a woman. It is an abomination.”

Ronnie Monday of Portland, Tennessee told NBC affiliate WSMV that he decided to erect the billboard after Obama publicly endorsed marriage for gay and lesbian couples.

“When the president came out and indicated that he thought gay marriage was okay, then that was pretty much the last straw. I thought God needs his voice out,” Monday said.

“I just felt like something had to be done. I hate to see America turn their back on God,” he added.

Monday, a Vietnam veteran, funded the billboard with donations from friends. It went up four months ago and is expected to remain through February.