Here is a link to Rabbi Cahn's full speech along with a salient except from same:
Jonathan Cahn's Last Words to Obama and Charge to President Trump
"But something happened to the city on the hill. As the people of ancient Israel, in the midst of their blessings, committed a fatal error, so too have we. We have turned away from God. We've ruled Him out of our culture, out of our government, out of our lives, and banned Him from our public squares.
"In His place we have brought in idols of carnality and gain, and gods of materialism and licentiousness. We have replaced the eternal standards of righteousness for a new morality of immorality. The nation that was brought forth to fill the world with the light of God, now fills the earth with pornography. And what we once knew to be sin, we now call good, and what we once knew to be right, we now call intolerant and dangerous. And those who held true to God and His Word, were now marginalized, mocked, and vilified. We have become a civilization inverted, at war against the foundation upon which it had been established, and against the God of its foundation.
"We have descended to the darkest of sins. Israel killed thousands of its children on the altars of Baal. But we have killed millions. We've offered up our unborn children on the altars of self-obsession. It was here in this city that their murder was legalized forty four years ago. And their blood cries out to Heaven against us."
Also check out Biblical prophecy is primarily about Israel & the Jewish people, not America! which includes a brief look at Rabbi Cahn's bestselling book "The Harbinger".