There have been so many instances where you think, yep, this is it … this is where Donald John Trump goes down for the count.

Then he gets up.

He denigrates a Vietnam War hero such as Sen. John McCain. He mocks a disabled New York Times reporter. He brags about grabbing women by their private parts. He disparages a Gold Star family that happens to worship the Islamic faith.

He survived all of those so-called “tipping points” en route to the presidency of the United States.

Today, though, provided the world a fresh glimpse of the Donald Trump many of us feared would present himself. He denigrated the U.S. intelligence network’s belief that Russian goons attacked our 2016 election system, they attacked our very democratic system of government.

He did so in the presence of the man U.S. spooks say ordered it: Russian President Vladimir Putin.

The president of the United States, for the first time in many historians’ memory, has relegated defense of our democratic system to second place behind fealty to the leader of a hostile foreign power.

Who in the world ever thought they would see such an event, or hear the president say what he said today in casting doubt on our intelligence experts’ view that Russia sought to influence the outcome of a presidential election?

We have crossed a new threshold in this country. We now are treading on treacherous ground.

If only the so-called “patriots” within the Republican Party — the president’s own party — would stand up and say: Enough is bloody enough!