Congressional Democrats and President Donald Trump are in a stand-off over impeachment, with Democrats requesting documents and interviews from the executive branch and the administration defying those requests by citing executive privilege and declaring Congress’ investigations invalid. It’s a constitutional clash with one all-but-inevitable end point: The Supreme Court.
In order to conduct an impeachment inquiry and come to a decision about whether Trump has committed offenses unbefitting of his office, Congress needs to consider evidence. In an inquiry focused on Ukraine, it would need testimony from individuals involved in diplomacy there and others at the White House. But the administration is stonewalling by blocking witnesses and ignoring subpoenas by asserting the president has a right to confidentiality in his conversations with advisers, and more broadly alleging that the House’s impeachment investigation is an unconstitutional political vendetta.