Vice President Biden on Monday said he had to attend a reception for U.S. cardinals attending Pope Francis's inaugural mass or he would "lose" his soul.

Biden is the Obama administratin's emissary to Vatican City for the new pope's inaugural mass. His comments came during a meeting with Serbian President Tomislav Nikolic.

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"We invited the American cardinals to a reception," Biden said to Nikolic according to a White House pool report. "So unless I'm prepared to join the Eastern Orthodox Church, as a Roman Catholic, I'd better show up or I'll lose my soul."

The delegation Biden is leading includes New Mexico Gov. Susana Martinez ( R) and House Minority Leader Nancy Pelosi (D-Calif.).

A number of other House lawmakers also travelled to the Vatican for the inaugural mass. That group, lead by Rep. Chris Smith (R-N.J.), includes Reps. Rosa DeLauro (D-Conn.), Sean DuffySean DuffyGOP rep: Dems have done nothing to fix ObamaCare CNN host, GOP rep spar over Trump wiretap talk GOP targets Baldwin over Wisconsin VA scandal MORE (R-Wis.), Anna Eshoo (D-Calif.), Jeff FortenberryJeff FortenberryThe Hill's Whip List: 36 GOP no votes on ObamaCare repeal plan Trump's plan for safe zones in Syria necessary for the civil war's end A guide to the committees: House MORE (R-Neb.), Rubén Hinojosa (D-Texas), Jim Langevin (R-R.I.), Daniel Lipinski (D-Ill.) and Loretta Sanchez (D-Calif.).

The reception is meant for members of the delegation as well as U.S. officials in Rome.