Bryan Fischer of the Christian conservative American Family Association (AFA) is calling on Congress to impeach President Barack Obama over his handling of the Defense of Marriage Act (DOMA).

DOMA, the 1996 law which prevents federal agencies from recognizing the legal marriages of gay and lesbian couples, is being challenged in a number of cases. One case, Windsor v. United States, has reached the Supreme Court.

The Obama administration has been active in the cases, at first defending the law in court. But in 2011, at the direction of the president, the Department of Justice went from defending the law to calling on courts to strike it down.

In Windsor v. United States, the administration called on the Supreme Court to find DOMA unconstitutional.

(Related: Obama calls on Supreme Court to strike down DOMA.)

Fischer argued in a column published on Friday that Obama had “committed an impeachable offense” and that the government should instead campaign against homosexuality.

“Homosexual sex is not behavior that any rational society should endorse, promote, normalize, or protect in law. Calling relationships 'marriages' that are based on the act of sodomy, which was a felony everywhere in America for the first 255 years of our existence, gives society's ultimate stamp of approval to behavior that is self-destructive, destroys human health and shortens life. This is obviously short-sighted and callous public policy.”

“We should no more normalize homosexual conduct, let alone homosexual marriage, than to normalize shooting up with needles.”

“We have spent billions of dollars urging children not to take up cigarette smoking because of its harm to human health. We should be making the same effort persuading children and adults not to start engaging in homosexual conduct, and if they have started, helping them to stop.”