More than 100 House Republicans are joining dozens in the Senate pushing to block President Obama from giving billions of dollars to foreign countries for climate change aid.

The Republicans are taking aim at the $3 billion Obama wants to contribute to the Green Climate Fund, a United Nations-backed effort that’s part of a plan to give poor nations $100 billion annually by 2020 to adapt to and mitigate climate change.

{mosads}“We are concerned about making any commitments to support new funding through the Green Climate Fund, given the U.S. government’s already significant climate change related spending to date,” the lawmakers, led by Rep. Morgan Griffith (R-Va.), wrote to leaders of the House Appropriations Committee late Monday.

“This request from the president appears to be just the beginning of a commitment to the United Nations that could dwarf previous such climate commitments made by the United States government,” they said.

The would-be recipients of the fund have said they’re unlikely to get on board with an international climate pact without the money.

The request comes less than a week before world leaders meet in Paris to work out the climate pact. When 37 Senate Republicans made a similar request last week, they made it clear that it was an attempt to stop a deal from being signed.

Appropriators in the House and Senate are up against a Dec. 11 government funding deadline to write and pass an appropriations measure.

The Republicans in both chambers who wrote the measures are seeking explicit language to prevent any money appropriated from going to international climate aid.