U.S. and Iranian officials said the deal included a 60-day cease-fire to pave the way for negotiations toward a final peace agreement and talks on Iran's nuclear program.
The nonprofit, established by Congress a decade ago and separate from President Trump's Freedom 250, will bring Smashing Pumpkins and other acts to Los Angeles on July 4.
In a letter to Interior Secretary Doug Burgum and national parks officials, lawmakers said that members of the administration could face fines and even criminal prosecution.
The health secretary is trying to restart the work of a panel that advises the government on vaccines, after a judge froze its decisions and prevented it from meeting.
While the president says the agreement with Iran would open the Strait of Hormuz and provide economic relief, the country's nuclear program is still a subject for negotiation.