Teamsters President Backs Markwayne Mullin at DHS Secretary Confirmation Hearing immigration Markwayne Mullin Politics Senate confirmation hearings Teamsters Teamsters President Backs Markwayne Mullin at DHS Secretary Confirmation Hearing John Binder March 18, 2026 Teamsters President Sean O'Brien sat behind Sen. Markwayne Mullin (R-OK) in a sign of support as he... Read More Read more about Teamsters President Backs Markwayne Mullin at DHS Secretary Confirmation Hearing