Maryland Sen. Chris Van Hollen sent a letter to President Trump on Tuesday detailing the conversation he had about Kilmar Abrego Garcia with the vice president of El Salvador.

Sen. Chris Van Hollen on Sunday repeatedly sidestepped questions about whether Kilmar Abrego Garcia was an MS-13 gangbanger as the Trump administration has alleged. Van Hollen (D-Md.), who met with Abrego Garcia in El Salvador on Thursday notably refused to deny that Abrego Garcia was gang member and confessed he did not ask him about the alleged ties when they spoke — despite CNN’s Dana Bash asking him point-blank if he could say “with absolute certainty” that the deported illegal migrant wasn’t a member of the vicious gang.

The Trump administration claims that judges’ orders in the cases of immigrants deported to a prison in El Salvador intrude on the president’s right to conduct foreign policy.