Whether they stand to the right or left of Pope Francis on issues, members of Congress should not expect the pontiff to hand out clear answers.
Speculation abounds as to the topics Pope Francis will broach on Thursday when he becomes the first pontiff to address Congress.
Francis, who will address a joint session, has been expected to talk on topics dearest to his heart and among the thorniest in Washington: immigration, abortion, and economic inequality.
But even as the pope finishes out his stop in Cuba, pundits increasingly say Francis may frame his address mainly around climate change.
The progressive-thinking pontiff this summer issued an encyclical - or official papal document - on humanity's responsibility to care for the environment and the millions whose lives are directly impacted by climate change.
Arizona Republican, Rep. Paul Gosar has come under attack for announcing he will boycott the pope's address to Congress because he feels the pope will likely refrain from using his moral and religious authority to address U.S. lawmakers about the persecution of Christians and abortion.
In an op-ed piece for Time magazine, Gosar writes that the pope is poised to squander an "opportunity to address the enslavement, belittlement, rape and desecration of Christian women and children; to address the condoned, subsidized, intentionally planned genocide of unborn children by Planned Parenthood and society; and finally, an opportunity for His Holiness to refocus our priorities on right from wrong."
It's not the first time Francis and lawmakers have stood in seemingly opposing corners.
Over the last few months, Catholic lawmakers - in particular among the GOP presidential hopefuls - have chided the pontiff for wading into debates seemingly ill-suited for a religious leader, including the Iran nuclear deal, which Francis endorsed. The pope also raised the ire of conservatives when he helped broker the normalization of relations between the U.S. and Cuba.
Indeed, Francis has directly and indirectly chided lawmakers - here in the U.S. and abroad - for placing politics, policy and career agenda ahead of a humanitarian stance on such issues as immigration, poverty and economic inequality.
Some say the gulf between conservative Washington and the pope may not be as wide as it appears.
Rep. Lou Barletta, a Republican and Catholic from Pennsylvania, says pundits and the media often highlight the issues that seem to put the GOP at odds with the pope's teachings and not common ground.
Barletta cites the debate around abortion as an example where his party largely stands with the pope's call to protect the sanctity of life.
"Sometimes these issues were we differ are selectively highlighted versus many issues we agree on," said Barletta, who like the majority of his party members in the House on Friday voted to defund Planned Parenthood, amid illegal handling of aborted fetal tissue.
Barletta said it's important that the pope is willing to address Congress and have a conversation with lawmakers.
"Obviously they are difficult issues," Barletta said. "That's why many haven't been resolved. I'm not sure what (Francis) will talk about, but I'm sure people of faith and people of no faith will benefit but that doesn't mean we should be afraid to listen to his views."
Barletta, who has been an outspoken advocate of hard-line immigration reform, said he does not consider his views to be in conflict with that of the pope's teachings.
Francis has excoriated lawmakers for focusing on policy and the legal and social issues of immigration not the humanitarian urgency of the tide of immigrants fleeing danger in their countries - including the thousands of unaccompanied minors that earlier this year flooded across the U.S. southern border from Central America.
"I believe there is much where we agree," Barletta said. "I agree that immigrants are seeking an opportunity for a better life and that's what America offers. There's no country on earth that has a better safety net for its citizens than the U.S. but I believe that we need to follow the law. And the church and its teachings and the pope in his teachings believe that as well."
Rick Garnett, a professor of law and political science at the University of Notre Dame, said the pope is not likely to hand out report cards. Any American politician, regardless of party, who feels affirmed by Francis is not paying attention, he said.
"He is not interested in making politicians -- whether 'liberal' or 'conservative' -- feel comfortable or smug," Garnett said. "Pope Francis's message -- like Catholic social teaching generally -- is not captured by any American political party or platform, and this should not be surprising, because the church's social teachings are grounded in claims about who we are, what we are for, and why we -- all of us -- matter that are very different from typical American views."
Indeed, Democrats such as Sen. Bob Casey, Jr., also a Catholic, has been aligned his policy views on climate change with that of the popes. But the liberal Pennsylvanian, who describes himself as a "pro-life" lawmaker, has incurred criticism from anti-abortion groups for opposing the move to defund Planned Parenthood. The National Right to Life group says Casey has only a 20 percent "pro-life' voting record.
"Clearly, a politician who supports abortion rights is not hearing Pope Francis's call to "go to the margins" and care for the vulnerable," Garnett said. "Clearly, a politician who engages in anti-immigrant demagoguery is not hearing Pope Francis's challenge to be welcoming and merciful to those who are suffering."
Garnett warned any politician or candidate from using the pope's visit as a photo-op to exploit at election-time or solicit a pat on the back.
"A Catholic politician -- like all Catholic citizens -- should be willing to be confronted and challenged," he said. "Pope Francis does not have, and does not claim to have, clear answers to all American policy questions. What he is urging us all to do, though, is to think through these questions in a spirit that is always mindful of the vulnerable and thankful for our many gifts."
Barletta said he hopes that on Thursday the members of Congress will leave politics at the door as they enter the chamber to hear Francis speak.
"We can agree or disagree with some or all of what he says or what he says can make people pause and rethink their positions," Barletta said. "This is wonderful opportunity for our country to have this visit by the pope....The Pope is a man of peace. He is the leader of one of the great religions of the world. We should all listen and consider what he has to say."