U.S. Secretary of Homeland Security Alejandro Mayorkas speaks about an investigation into the treatment of Haitian migrants on the U.S.-Mexican border as he addresses the daily briefing in the Brady Press Briefing Room at the White House in Washington, September 24, 2021.Evelyn Hockstein | ReutersWASHINGTON — Homeland Security Secretary Alejandro Mayorkas tested positive for Covid-19 on Tuesday, according to a statement from a DHS spokeswoman to NBC News. “Secretary Mayorkas tested positive this morning for the COVID-19 virus after taking a test as part of routine pre-travel protocols,” the statement said. “Secretary Mayorkas is experiencing only mild congestion; he is fully vaccinated and will isolate and work at home per CDC protocols and medical advice. Contact tracing is underway.”On Saturday, Mayorkas, 61, joined President Joe Biden, First Lady Jill Biden and other high-ranking officials at the annual National Police Officers’ Memorial Service at the U.S. Capitol.Homeland Security Secretary Alejandro Mayorkas, alongside leaders from across the Federal Government, including President Joe Biden, attends the Annual National Police Officers’ Memorial Service at the U.S. Capitol, October 16, 2021.Benjamin Applebaum | Department of Homeland SecurityMayorkas (above, third from the left) can be seen in photos from the outdoor event standing just a few feet from the president, while neither he nor Biden are wearing masks.Both Biden and Mayorkas are fully vaccinated against Covid. Biden also received a booster shot in late September, in accordance with guidelines from the Centers for Disease Control and Prevention.A White House spokesman did not immediately respond to a question from CNBC about whether Biden will take any additional precautions in light of Mayorkas’ diagnosis.The day before the Capitol event, Mayorkas attended the Customs and Border Protection (CBP) Valor Memorial and Wreath Laying Ceremony, honoring CBP officers who lost their lives in the line of duty. This is breaking news. Please check back for updates.