WASHINGTON (TheBlaze/AP) -- Vice President Joe Biden has a commandment for pastors, rabbis and nuns: He wants them to tell their flocks that enacting gun control is the moral thing to do. But another vote may have to wait until Congress wraps up work on an immigration overhaul.

Biden met for two-and-a-half hours Monday with more than a dozen leaders from various faith communities - Christian, Jewish, Muslim and Sikh, to name a few. Both Biden and the faith leaders encouraged each other not to give up on what has been an arduous and thus far fruitless effort by Biden and President Barack Obama to pass new gun laws in the wake of December's schoolhouse shooting in Connecticut.

Biden Urges Pastors, Rabbis and Nuns to Tell Their Flocks: Enacting More Gun Control Is the Moral Thing to Do

U.S. Vice President Joe Biden speaks during a ceremony honoring members of the American Foreign Service Association who died while serving overseas at the U.S. State Department May 3, 2013. Credit: Getty Images

Around a large, circular table in a conference room on the White House grounds, Biden waxed optimistic about prospects for passing a bill, according to four participants who spoke to The Associated Press after the meeting. Biden's chief of staff, Bruce Reed, joined the group, as did a handful of Obama aides who work on faith-based outreach. The meeting closed with a meditation and a prayer for action.

But don't expect a vote any time soon.

"The conversation presumed the vote would happen first on immigration," said Rabbi David Saperstein, who directs the Religious Action Center of Reform Judaism. "That seemed to be the back-and-forth on both sides -- that immigration was a key priority right now. When that vote took place, it would be an opportunity to refocus on this."

A far-reaching immigration overhaul is in the early stages of advancing through the Senate. Obama said last week he's optimistic it can be completed this year.

Although momentum on gun control stalled in the Senate last month, Biden has insisted the issue is very much alive, and has been meeting regularly with gun violence victims and law enforcement to build support for a second go at legislation to expand background checks, improve mental health care and take other steps to reduce gun violence.

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Biden Urges Pastors, Rabbis and Nuns to Tell Their Flocks: Enacting More Gun Control Is the Moral Thing to Do

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Monday's session reflects an attempt to broaden the coalition calling for new gun laws to include a wide array of religious groups -- including evangelicals and conservative faith communities. Without naming names, Biden alluded to senators who opposed background checks - the centerpiece of the Obama administration's push - who have faced a backlash in the weeks since and could possibly be picked off if the issue comes back for a vote.

Lingering concerns from some participants illustrated the ongoing challenge the administration faces in winning support for the proposals, even though Biden and Obama regularly tout polls suggesting they enjoy broad support. Some participants raised questions about whether background checks could lead to a national gun registry or whether mental health provisions would be used to create a list of individuals permanently banned from obtaining guns.

"There were some very powerful evangelical leaders in the room who needed to be reassured," said Pastor Michael McBride of the PICO National Network, a faith-based organizing network.

Biden Urges Pastors, Rabbis and Nuns to Tell Their Flocks: Enacting More Gun Control Is the Moral Thing to Do

Credit: AFP/Getty Images

Citing what he described as misinformation from the National Rifle Association and others, Biden said the renewed push for gun control must correct misconceptions about what the proposals do and don't do, participants said. He asked clergy to keep up the pressure and to reframe the debate for their followers in moral terms.

A spokeswoman for Biden declined to comment on the meeting. But Rabbi Julie Schonfeld, executive vice president of the Rabbinical Assembly, said a diverse spectrum of denominations and religious orders were represented. She said they included evangelical leaders Richard Cizik and Franklin Graham, the son of evangelist Billy Graham, as well as Sister Marge Clark of Network, a Catholic group.

In March, TheBlaze reported that Graham, along with Richard Land, had come out in support of universal background checks.

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