Hundreds of “national security professionals,” who have worked for previous presidents, are sounding the alarm on “President Trump’s actions and their implications for our safety and security.” The letter published by the Washington Post says “the revelations of recent days… demand a response.”

Here are a couple of excerpts:

President Trump appears to have leveraged the authority and resources of the highest office in the land to invite additional foreign interference into our democratic processes. That would constitute an unconscionable abuse of power. It also would represent an effort to subordinate America’s national interests—and those of our closest allies and partners—to the President’s personal political interest.

Having worked across administrations of both parties to uphold and advance those national interests, we consider the President’s actions to be a profound national security concern.

The group goes on to say:

There is no escaping that what we already know is serious enough to merit impeachment proceedings. From there, the facts—and nothing but the facts—should dictate how Congress holds the President to account and signals to the world that our foreign policy and national security are not for sale.