The GOP has become embroiled in a bitter and "extraordinary feud," according to a new report from The Washington Post, over the actions of a "virtually unknown" but vital Trump appointee within the Pentagon.Elbridge Colby is the current undersecretary of defense for policy, a position which, the Post explained, "serves a vital role as the Pentagon’s chief strategist on issues such as counterterrorism and nuclear deterrence." Additionally, unlike…