Definitely a low-water mark for Donald Trump. Many Republicans and conservatives have no problem standing with Trump when he's getting viciously attacked by the lib media, masquerading as real news reporters. But this is indefensible.
O'Reilly is exactly right that Putin is a killer because (wait for it) Putin is a killer. People who oppose him disappear and others end up with a dose of radioactive polonium 210 (see Alexander Litvinenko)
Then Trump says, "If Russia helps us in the fight against ISIS, that's a good thing." Absolute hogwash and Donald Trump knows it. Putin never went into Syria with any intention of hitting ISIS, Putin went after U.S. backed, anti-Assad Syrian rebels and nobody else. Putin's air force hit the city of Homs, which had zero ISIS presence. Everyone knows, including Trump that fighting ISIS was a convenient excuse for Putin to be there. Putin has also slaughtered tens of thousands of innocent civilians in Syria to achieve his goal.
It's an absolute shame that our tough as nails new sheriff in town president would give a tyrant like Vladimir Putin as pass.