A group of powerful Republican senators wants to make sure the bailout program being administered by BlackRock Inc. on behalf of the federal government won’t leave fossil-fuel companies behind.

The U.S. government tapped BlackRock, the world’s largest asset manager, to become the buyer of corporate bonds as part of a $454 billion effort to bail out companies hit by the coronavirus lockdown. That triggered a letter from Greenpeace, Sierra Club, 350.org and other environmental organizations on March 27 urging Federal Reserve Chairman Jerome Powell to weigh climate risk in its guidelines for BlackRock as it decides what sectors of the economy get financial support.

Now, in a letter sent Tuesday, a group of 17 Republican senators, including James Inhofe of Oklahoma and Ted Cruz of Texas, are asking Powell and U.S. Treasury Secretary Steve Mnuchin to ensure that fossil-fuel companies aren’t excluded from the bailout program being administered by BlackRock.

The pandemic has created an unprecedented upheaval in the global economy. With governments around the world pouring huge sums of money into propping up struggling companies, climate advocates see an unprecedented opportunity to speed up the transition to clean energy and make entire industries as green as possible. Republican lawmakers have opposed this encroachment from environmental groups, pushing back and largely succeeding so far in separating stimulus spending from climate concerns.