President Trump on Sunday went scorched-earth against Sen. Bob Corker (R-TN), saying the Senate Foreign Relations Committee chairman “didn’t have the guts to run” for re-election. “Senator Bob Corker ‘begged’ me to endorse him for re-election in Tennessee. I said ‘NO’ and he dropped out (said he could not win without my endorsement),” Trump wrote on Twitter, adding: “He also wanted to be Secretary of State, I said ‘NO THANKS.’ He is also largely responsible for the horrendous Iran Deal!” The president also said Corker, who advised Trump’s transition team on foreign policy matters, would be “a negative voice and stand in the way of our great agenda.” Corker responded to the barbs later Sunday, writing on Twitter: “It’s a shame the White House has become an adult day care center. Someone obviously missed their shift this morning.” Trump’s tweets underscore his longstanding anger at congressional Republicans for not fully supporting him. Last week, Corker said Secretary of State Rex Tillerson, Defense Secretary James Mattis, and White House Chief of Staff John Kelly “help separate the country from chaos.” Earlier in the week, Corker criticized Trump for his public comments about the country’s strategy for dealing with North Korea, in which the president openly undermined Tillerson.