Retired Army Lt. Gen. H.R. McMaster was pressed on MSNBC on Friday afternoon on why he hasn’t endorsed Kamala Harris for president given what he wrote about former President Donald Trump. McMaster published his book about working in the White House as the short-lived National Security Advisor, which detailed Trump’s recklessness. After walking through a number of questions about Trump, MSNBC’s Katy Tur questioned why McMaster could give so many reasons that Trump should not be president but refuses to endorse Vice President Kamala Harris. “You’re writing about how he had a penchant for pitting…