House Minority Leader Nancy Pelosi (D-Calif.) on Tuesday said President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE's desire for a wall along the U.S-Mexico border is a "manhood issue," adding that she will oppose the wall and isn't interested in negotiating.

“It happens to be like a manhood issue for the president, building a wall, and I’m not interested in that,” Pelosi said during a discussion at the Harvard Kennedy School’s Institute of Politics.

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Pelosi said Democrats support border security, and that they can't allow Trump to say otherwise. The president has often said Democrats want "open borders."

“We can’t allow him to say we’re not interested in protecting the border,” Pelosi said, adding that the wall is "probably the worst way to protect the border.”

Building a wall along the southern U.S. border has been promising to build a border wall since 2015, when he began his campaign for the White House.

The debate over constructing a wall could come to a head during the lame-duck session after the Nov. 6 midterm elections since Congress faces a Dec. 7 deadline to fund the Department of Homeland Security, which has jurisdiction over border issues.

If lawmakers and Trump can't reach a deal on funding, that would lead to a partial government shutdown.