Some refugees who had been approved to come to the US had their travel canceled on short notice, and families who have waited years to reunite have had to remain apart, the lawsuit said.

A legal challenge to President Donald Trump’s executive order freezing refugee arrivals and funding is scheduled for a hearing before U.S. District Judge Jamal Whitehead in Seattle on Tuesday. Individual plaintiffs along with three nonprofits serving refugees are asking the court to put the order on hold while the case proceeds.

A federal judge has blocked President Donald Trump’s executive order implementing an indefinite “pause” on refugee admissions to the United States, saying the directive appeared to amount to a “nullification” of federal law.