Returning from vacation? The government can search your phone without a warrant.

An Argentinian-American writer and immigration advocate recently sued the federal government, demanding that it delete data that he believes was copied off of his phone when he re-entered the United States earlier this month.

According to the seven-page complaint, Thomas Kennedy said that a Customs and Border Protection agent at Miami International Airport physically searched his bags, questioned him about his books and magazines, and then demanded that he hand over his phone.

“[The agent] threatened me, saying that if I didn’t give him my phone, my interrogation was going to take much longer and they could retain my phone indefinitely,” Kennedy wrote. “I felt like I had no choice, so I handed my phone to the CBP agent.”