Senate Minority Leader Charles Schumer Chuck SchumerPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' 3 reasons why Biden is misreading the politics of court packing Cruz blocks amended resolution honoring Ginsburg over language about her dying wish MORE (D-N.Y.) on Monday vowed to oppose any post-Brexit trade deal with the United Kingdom that would risk Northern Ireland's peaceful status quo with Ireland.

In a letter to Secretary of State Mike Pompeo Michael (Mike) Richard PompeoWatchdog confirms State Dept. canceled award for journalist who criticized Trump Trump's push for win with Sudan amps up pressure on Congress Putin nominated for Nobel Peace Prize MORE, Schumer praised the Good Friday Agreement between Ireland and the U.K. as a "towering achievement of diplomacy and it planted the seeds of a society based on mutual respect and equality, rather than one based on distrust and discrimination."

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The agreement, which created a free and demilitarized border between Ireland and Northern Ireland in 1998, ended the then-decades long Northern Ireland conflict.

Despite successfully maintaining the peace for more than two decades, the agreement is now threatened by the prospect of a British withdrawal from the European Union without a deal.

Exiting that way would likely require imposing a hard border between Northern Ireland and Ireland.

Schumer joins Speaker Nancy Pelosi Nancy PelosiDemocratic senator to party: 'A little message discipline wouldn't kill us' Overnight Health Care: New wave of COVID-19 cases builds in US | Florida to lift all coronavirus restrictions on restaurants, bars | Trump stirs questions with 0 drug coupon plan Overnight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds MORE (D-Calif.) in opposing any U.S.-U.K. trade deal that would threaten the Good Friday Agreement.

"In this, I stand shoulder-to-shoulder with the bi-partisan, bi-cameral supporters of the Good Friday Agreement (and opponents of a return to a hard border), especially including Speaker Nancy Pelosi, and will do all in my power to work in a bi-partisan way to prevent such pact from receiving the approval of Congress," the New York Democrat said Monday.

Any new trade deal to substitute the U.S.-U.K. agreements negotiated through the EU would have to be brought to a vote in Congress, meaning the Speaker could block it.

Members of the Trump administration and Republican lawmakers have backed a new trade deal regardless of whether a hard border has to be imposed.

National security adviser John Bolton John BoltonJudge appears skeptical of Bolton's defense of publishing book without White House approval Maximum pressure is keeping US troops in Iraq and Syria Woodward book trails Bolton, Mary Trump in first-week sales MORE said earlier this month that the U.S. would support a "no deal" Brexit, which would likely trigger the hard border. Senate Finance Committee Chairman Chuck Grassley Charles (Chuck) Ernest GrassleyGOP lawmakers distance themselves from Trump comments on transfer of power The Hill's 12:30 Report: Ginsburg lies in repose Top GOP senators say Hunter Biden's work 'cast a shadow' over Obama Ukraine policy MORE (R-Iowa) also recently said he would support a no-deal exit.

New British Prime Minister Boris Johnson has promised an exit from the EU by Oct. 31, but faces several roadblocks to negotiating a new deal.