Intelligence agencies have concluded Russia did meddle in the election and numerous investigations are under way to determine whether Trump's campaign aided the Kremlin.
Bush also said the U.S. needs to reform its immigration law and described Russian President Vladimir Putin as "zero-sum." Bush said of the Russian leader: "He can't think, 'How can we both win?' He only thinks, 'How do I win, you lose?'"
Bush said of Putin: "He's got a chip on his shoulder. The reason he does is because of the demise of the Soviet Union troubles him. Therefore, much of his moves (are) to regain Soviet hegemony ... That's why NATO is very important."
This is not the first time Bush has spoken publicly about alleged Russian interference in the election. In address in New York last year he said of the 2016 vote: "The Russian government has made a project of turning Americans against each other."