Republicans are losing yet another high-ranking House committee leader to retirement. Rep. Mark Green (R-TN) announced that he wouldn’t seek re-election on Thursday afternoon, after just a single term in charge of the House Homeland Security Committee. Earlier in the day, he had denied he was retiring to CNN’s Melanie Zanona and Politico’s Olivia Beavers, even calling it a “weird question” — but later confirmed it. “At the start of the 118th Congress, I promised my constituents to pass legislation to secure our borders and hold [Homeland Security] Secretary Mayorkas accountable,” said Green in…