A spokeswoman for the presidency of El Salvador, Wendy Ramos, did not respond to requests for information about Senator Van Hollen’s meeting with Abrego Garcia, including whether he had been returned to the prison where American officials have said he is being held, the Terrorism Confinement Center, or CECOT.

President Donald Trump accused Sen. Chris Van Hollen of political grandstanding after the Maryland Democrat managed to meet this week with an immigrant who had made a life in his state before being wrongfully deported to El Salvador last month.