Joe Bidens DHS Nominee Alejandro Mayorkas Will Not Commit to Not Tearing Down Border Joe Bidens DHS Nominee Alejandro Mayorkas Will Not Commit to Not Tearing Down Border Wall During his Senate confirmation hearing on Tuesday, President-elect Joe Bidens nominee to lead the Department of Homeland Security (DHS), Alejandro Mayorkas, would not commit to not tearing down existing border wall built by President Trumps administration. Mayorkas, when questioned by Sen. James Lankford (R-OK), said he had not yet looked at the specific issue when asked whether he would take a sledgehammer to physical barriers along our southern border.