Violating The Oath They Took
Just what does it mean to take an oath to defend the Constitution against all enemies, foreign and domestic? Let's look to another time when the country was under attack from within.
Members of Congress today take this oath,
I do solemnly swear (or affirm) that I will support and defend the Constitution of the United States against all enemies, foreign and domestic; that I will bear true faith and allegiance to the same; that I take this obligation freely, without any mental reservation or purpose of evasion; and that I will well and faithfully discharge the duties of the office on which I am about to enter: So help me God.
This oath was brought in following more severe changes in the oath during the 1860s Nort/South conflict, According to Senate.gov,
In April of 1861, a time of uncertain and shifting loyalties, President Abraham Lincoln ordered all federal civilian employees within the executive branch to take an expanded oath. When Congress convened for a brief emergency session in July, members echoed the president's action by enacting legislation requiring employees to take the expanded oath in support of the Union. This oath is the earliest direct predecessor of the modern oath.
Then as now the country was under attack from within. Those still loyal to the Constitution insisted that officials take an "Ironclad Test Oath" swearing they had never engaged in disloyal conduct. The difference is that then they enforced it, and those who took the oath falsely were prosecuted for perjury. Today, not so much.
The Fourteenth Amendment of the U.S. Constitution, Section. 4: The validity of the public debt of the United States, authorized by law, including debts incurred for payment of pensions and bounties for services in suppressing insurrection or rebellion, shall not be questioned.