Customs and Border Protection (CBP) agents defied the orders of federal judges regarding Donald Trump’s travel bans on Sunday, according to members of Congress and attorneys who rallied protests around the country in support of detained refugees and travellers from seven Muslim-majority countries.

On Sunday afternoon, four Democratic members of the House of Representatives arrived at Dulles airport in Virginia on word that people had been detained and denied access to lawyers.

“We have a constitutional crisis today,” representative Don Beyer wrote on Twitter. “Four members of Congress asked CBP officials to enforce a federal court order and were turned away.”

Representative Jamie Raskin, also at the airport, tweeted that the federal agency had given “no answers yet” about whether agents were ignoring the courts. Raskin joined several other attorneys there, including Damon Silvers, special counsel at AFL-CIO, one of the groups trying to help visa holders.