Various media are reporting that the Obama administration will file a brief in support of gay marriage with the Supreme Court in a case challenging the constitutionality of California's Proposition 8, the 2008 voter-approved constitutional amendment which limits marriage to heterosexual couples.

As recent as last week, Obama said he was unsure whether the Justice Department would weigh in on the case.

“The solicitor general is still looking at this,” Obama told San Francisco ABC affiliate ABC7's Dan Ashley. “I have to make sure that I'm not interjecting myself too much into this process, particularly when we're not a party to the case.”

Proposition 8 put an end to the marriages of gay and lesbian couples taking place in the state after the California Supreme Court struck down the state's law excluding gay couples from marriage.

Thursday is the final day the administration can file an amicus brief in the case.

“Obama Justice Dept to file Supreme Court amicus brief today opposing Prop 8 in Calif and expressing support for same-sex marriage to resume,” NBC News' Pete Williams tweeted.

The Courage Campaign, a progressive organization based in California, applauded the president's decision in a statement.

“We applaud President Obama for standing-up for millions of Californians who simply want to marry the person they love,” said Rick Jacobs, founder and chairman of the Courage Campaign. “The two Supreme Court cases this summer will be a watershed moment for equality and President Obama has put his Administration squarely on the right side of history. Last November, voters from Maine to Washington stood up for equality. Now it's time for the Supreme Court to catch up with the American public. Discrimination and hatred have no place in a country founded on the principles of liberty, justice and equality.”