A federal judge issued a preliminary injunction Tuesday blocking the Trump administration from implementing the type of sweeping freeze on grant and loan programs proposed in a memo the Office of Management and Budget released in late January.

In the weeks following President Donald Trump’s crackdown on undocumented immigrants nationwide, several tribal nations have expressed their concerns about their citizens being stopped and questioned by Immigration and Customs Enforcement agents.

In light of these concerns, 15 U.S. senators wrote a letter to Secretary of Homeland Security Kristi Noem.