But that is really not true. For the first two years, Democrats in Congress responded publicly to what they thought were inappropriate or illegal actions, both at a personal level and a policy level. but had little recourse. In a few cases, they challenged Trump's actions in court; Trump won some of those legal challenges and Democrats won some. This was no different than Republican legal challenges of Obama's actions. For the last nine months since they became the majority in the House , they have taken on the Constitutional oversight role and called on the Trump administration to explain specific policy actions in Congressional hearings and Trump repeatedly refused to allow members of his administration to appear in those oversight hearings. Republicans held countless oversight hearings over the Obama administration and with only a few exceptions, Obama complied with requests for members of his administration to appear. Some went on for months and months with no other purpose than to find a "got you" to use against Obama. The system of "checks and balances" is at the very foundation of the Constitution with the intent of ensuring that the president does not abuse the power of his office. In fact, in terms of co-equal branches of government the framers put the Legislative branch, Congress, first in the Constitution (Article I) over the Executive branch (Article II). And Trump continues to willfully deny the co-equal status of Congress. Oversight of the executive branch is a critical role of Congress, equal to enacting laws and approving government spending. Every president has been subjected to Congressional oversight. No president has attempted to deny Congress its right to perform this oversight function as much as Trump.; not even close by any recent president. In the last two months, that oversight has reached a new level with charges brought by a whistleblower of actions by Trump that were believed to be illegal. Two Trump appointees - the Intelligence Inspector General and the CIA top legal counsel - said the whistleblower's report appeared to be "credible and urgent" and resulted in an appropriate House investigation. As more evidence was revealed despite Trump refusing to cooperate, it became an "impeachment inquiry" so that some present and former Trump officials could be compelled to testify. Impeachment is the role of last resort when there is evidence that a president may have violated his/her oath of office.