"In the entire history of our country, Americans have never seen a president of the United States support an American adversary the way President Trump has supported President Putin."

"A single, ominous question now hangs over the White House: What could possibly cause President Trump to put the interests of Russia over those of the United States? Millions of Americans will continue to wonder if the only possible explanation for this dangerous behavior is the possibility that President Putin holds damaging information over President Trump."

Said Chuck Schumer.

"This is a disgraceful moment... The president’s party knows better. I know they do. I served with many of them. America needs them to speak out with clarity and conviction not just in this news cycle, but until there’s common sense governing America’s foreign policy."

Said John Kerry.

"It is tempting to describe the news conference as a pathetic rout — as an illustration of the perils of under-preparation and inexperience. But these were not the errant tweets of a novice politician. These were the deliberate choices of a president who seems determined to realize his delusions of a warm relationship with Putin’s regime without any regard for the true nature of his rule, his violent disregard for the sovereignty of his neighbors, his complicity in the slaughter of the Syrian people, his violation of international treaties, and his assault on democratic institutions throughout the world."

Said John McCain.

All quoted in The New York Times, here. Full video and transcript, here, in case you want to search there for the reason for these strong condemnations.