The Trump administration is denying passports to Americans on suspicion that their birth certificates are fraudulent, The Washington Post reported Wednesday.

The government is said to be cracking down on people whose birth certificates indicate they were born in Texas' Rio Grande Valley area and were delivered by midwives or physicians — in the past, birth attendants in the area have admitted to providing false birth certificates.

One man whose passport was revoked told The Post that the US State Department requested bizarre documents like evidence of his mother's prenatal care and rental agreements from his infancy.

The Post reported that at least hundreds of people have had their passport applications denied and in some cases been jailed and placed in deportation proceedings.

The Trump administration is denying passports to hundreds of Americans who live along the US-Mexico border, accusing them of using fraudulent birth certificates and demanding additional proof that they were, indeed, born in the United States, The Washington Post reported Wednesday.

In some cases, those people have even had their passports revoked, been jailed, or been thrown into deportation proceedings, immigration attorneys told The Post.

One American, whom The Post identified only as Juan, served in the US Army and in the Border Patrol and is now a state prison guard — but when he applied to renew his passport, The Post said, the State Department said in a letter it didn't believe he was a US citizen and asked for documents like evidence of his mother's prenatal care, a baptismal certificate, and rental agreements from his infancy.

"I served my country. I fought for my country," Juan told The Post, adding that the accusations infuriated him.

Citizens like Juan have come to the government's attention because their birth certificates indicate they were born with the assistance of midwives in Texas' Rio Grande Valley region between the 1950s and the 1990s.

The Rio Grande, which forms much of the border between the US and Mexico, seen from a helicopter on February 21 near McAllen, Texas. Getty Images/John Moore The government alleges that some of those doctors and midwives who worked in the area gave US birth certificates to babies who were actually born in Mexico — an accusation that several birth attendants admitted to in court in the 1990s.

The practice of denying passports to people who were delivered in the Texas-Mexico region by midwives started under the Obama administration, The Post reported, but the administration backed down after settling a lawsuit from the American Civil Liberties Union in 2009.

The State Department told The Post in a statement that passport applicants were asked to provide "additional documentation establishing they were born in the United States" if their birth certificates were filed by midwives or other birth attendants "suspected of having engaged in fraudulent activities."

"The US-Mexico border region happens to be an area of the country where there has been a significant incidence of citizenship fraud," the department added.

While immigration attorneys said passport applicants usually win their citizenship cases in court, The Post said, people accused of fraud told The Post the incidents made them question their identities as Americans.

"You're getting questioned on something so fundamentally you," a woman named Betty, who was denied a passport, told The Post.

The Trump administration has made a series of moves toward limiting citizenship.

The US Citizenship and Immigration Services agency is reportedly investigating fingerprint records to identify naturalized citizens who made fraudulent statements to obtain American citizenship.

The administration is also said to be preparing rules that would block some immigrants from obtaining citizenship if they used programs like public healthcare exchanges or food stamps.