A Venezuelan teenager has been forced back to Mexico by United States government authorities who denied her claims that she was fleeing political repression and violence, even after they accepted the same claims from her father.

The teenager, who is being identified by only her first name, Branyerly, is living alone in Matamoros, Mexico, across from Brownsville. According to her lawyer, US border agents on Monday and Tuesday denied her requests not to be sent back under the Trump administration's so-called "Remain in Mexico" programme for migrants.

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Branyerly and her father could not request asylum under another Trump policy, a ban on most asylum claims at the southern border for people who came through a "third country". But in January, an immigration judge allowed her father, Branly, into the US by granting what's called withholding of removal, which requires meeting a higher legal standard.

That same judge denied withholding for Branyerly, who was 17 when she originally arrived at the border and is now 18. Both she and her father say the immigration judge, Monica Thompson Guidry, asked him most questions during the hearing and asked her relatively few. The final result came as a shock to both of them.

She tried to request parole on Monday at one of the bridges connecting Brownsville and Matamoros. She was taken into an office on the US side briefly, then told to return to Mexico.

"I already lived one nightmare in Venezuela and another here," Branyerly said.

#laninavenezolana is going back to the bridge to ask @CBPRGV for parole. Justice for Branyerly. pic.twitter.com/rOTfNkUwOY — ***Jodi Goodwin*** (@JodiGoodwin17) February 18, 2020

Venezuela has experienced an economic collapse and political turmoil that has led to millions of people fleeing the country. Many have attempted to seek refuge in the US.

President Donald Trump, who has recognised Venezuelan opposition leader Juan Guaido as the country's legitimate leader, in his State of the Union address this month called Venezuelan President Nicolas Maduro a "socialist dictator" and said "all Americans are united with the Venezuelan people in their righteous struggle for freedom". But many Venezuelans seeking refuge in the US have been barred by a series of Trump administration policies clamping down on asylum.

"It's not only ironic but it smacks of speaking out of both sides of your mouth," said Jodi Goodwin, Branyerly's lawyer.

Branly says his political problems began when he rejected a job that would have required him to support the governing party. After he turned down the job, Branly says, he started receiving threatening calls at his home, saying his wife and daughter would be kidnapped.

He and his wife left Venezuela for the US in early 2019, leaving their daughter with a family friend. But she was soon threatened as well. So, Branly returned to Venezuela to find Branyerly, then travelled with her through Mexico to the southern US border. They arrived in July, shortly before her 18th birthday, and were placed into the "Remain in Mexico" programme until their January hearing.

Goodwin said Branyerly was in a "particularly vulnerable situation" as the daughter of a known political activist.

"She is vulnerable as a migrant. She is vulnerable as a child. She is vulnerable as a woman," Goodwin wrote in her request to US Customs and Border Protection (CBP) that Branyerly be allowed into the US while her immigration case continues. "In other words, there are any number of categories within which it is easy to tell that she is vulnerable being alone in Mexico."

CBP declined to comment on Tuesday.

As Branly spoke about his daughter's plight in Mexico and the guilt he feels, he began to weep. His voice choked up.

"What I care about is my daughter," he said. "How did they do it for me but not my daughter? I don't understand. I don't understand."