(CNN) House Speaker Nancy Pelosi will lead a group of Democratic lawmakers to a United Nations conference on climate change less than a month after the Trump administration began formally withdrawing the US from the Paris climate accord.

The House speaker on Saturday announced she will lead the congressional delegation to the UN COP25 environmental summit "to combat the existential threat of our time: the climate crisis." Pelosi did not specify which dates the group will attend the conference, which takes place from December 2-13 in Madrid.

"On behalf of the United States Congress, I extend my gratitude to the Spanish government for hosting this critical meeting, and for elevating the priority of the climate crisis to the forefront of the international conversation," Pelosi said Saturday in a statement.

Pelosi said she was proud to lead the congressional group -- which includes Florida Rep. Kathy Castor, who Pelosi tapped to lead the House's select committee on climate change -- "to reaffirm the commitment of the American people to combating the climate crisis." In May, the Democratic-led House passed the Climate Action Now Act , which aims to keep the US in the Paris climate agreement.

Under the landmark agreement to reduce emissions of planet-warming gases, countries are supposed to increase their commitments to reduce emissions of planet-warming gases every five years -- with the first of these updated pledges submitted by the end of 2020. Those revised pledges will be a key focus of the UN COP25 summit.