I came across this allegation in multiple places, including the New York Times. However, I couldn't find the quote anywhere.
Supporters of Mrs. Clinton have argued that Mr. Trump’s evident affinity for Russia’s president, Vladimir V. Putin — Mr. Trump has called him a great leader and echoed his policies toward NATO, Ukraine and the war in Syria — and the hacks of leading Democrats like John D. Podesta, the chairman of the Clinton campaign, are clear indications that Russia has taken sides in the presidential race and that voters should know what the F.B.I. has found.
Investigating Donald Trump, F.B.I. Sees No Clear Link to Russia - NYT Oct 31, 2016
So did he say it or not?