Maryland Sen. Chris Van Hollen (D) said he is traveling to El Salvador on Wednesday to check on the status of a deported legal resident. 

Kilmar Abrego Garcia made headlines after being removed by the Trump administration in an “administrative error” and sent to El Salvador’s notorious CECOT maximum security prison to be detained. 

“Following his abduction and unlawful deportation, U.S. federal courts have ordered the safe return of my constituent Kilmar Abrego Garcia to the United States,” Van Hollen said in a Tuesday statement.

The White House is "looking into" the legality of sending U.S. citizens to prisons in El Salvador, Press Secretary Karoline Leavitt said during a briefing Tuesday.

The big picture: President Trump has recently threatened to send Americans to a notorious El Salvador prison where several deported Venezuelans, who are alleged to be members of the MS-13 gang, and one erroneously deported Maryland man are being held.

President Donald Trump told El Salvador President Nayib Bukele that “homegrown” criminals are next on the list of people he plans to deport to the country’s supermax prison.

President Trump floated sending American citizens to Salvadoran prisons during a conversation with the Central American country’s leader on Monday — suggesting he build “five more” facilities to make room.

“Home-growns are next. The home-growns. You gotta build about five more places,” Trump told President Nayib Bukele in the Oval Office, prompting laughter from administration officials seated nearby.

U.S. President Donald Trump said on Monday he wants to deport some violent criminals who are U.S. citizens to El Salvador, where they would be incarcerated under an agreement with that country's government.

Trump's spoke to journalists at the White House during the state visit of Salvadoran President Nayib Bukele.

Nayib Bukele, El Salvador's president and self-styled "world's coolest dictator," is due to visit President Trump at the White House on Monday. He's the first Latin American leader to get an official invite to the Oval Office since Trump took office.

El Salvador's president, Nayib Bukele, has offered to accept deportees of any nationality from the US, including US citizens.

US Secretary of State, Marco Rubio, said late on Monday that Bukele "has agreed to the most unprecedented and extraordinary migratory agreement anywhere in the world."

Rubio described the agreement as a "safe third country" deal to deport citizens who have violated US immigration laws. It would mean the US could deport non-Salvadorean migrants to El Salvador.