Retired Lt. Gen. H.R. McMaster, who served as national security adviser under former President Donald Trump, said Monday his onetime boss bears some responsibility for the US’ chaotic withdrawal from Afghanistan in 2021. McMaster told CNN’s Anderson Cooper that the former president had made a decision in 2017 to maintain a US presence in Afghanistan, but that Trump then changed his mind. The Trump administration ultimately entered into an agreement with the Taliban requiring US troops to withdraw from the country by May 2021.