(CNN) President Donald Trump spoke with Russian President Vladimir Putin for an hour on Friday morning. But, nowhere during that 60 minutes did Trump find time to warn Putin against interfering in future elections as the Russians did in the 2016 presidential race.

"We didn't discuss that," Trump told reporters Friday afternoon. "Really we didn't discuss it. We discussed five or six things. We also went into great detail on various things."

Great detail! Various things!

Trump's refusal to raise the possibility of future election interference by the Russians isn't surprising. But it should be deeply concerning.

No one paying attention should be at all surprised that Trump seems disinterested in the documented Russian interference in our last presidential election. (The US intelligence community said in early 2017 that Russia had sought to interfere in order to help Trump and hurt Hillary Clinton. Special counsel Robert Mueller's report, released last month, backed up that assertion in vivid detail.) After all, Trump has long expressed skepticism regarding the role Russia played in the 2016 campaign -- admitting only under duress that the foreign power ran a deep and broad influence campaign.