This is a very public article and no denials came from the Obama administration.    It shows that politics requires each party to demonize the other party, often with no facts.     It's politics that Trump implies President Obama hated America.  It's politics to accuse President Trump of loving all thing Putin/Russia, with no hard proof.

President Trump's situaion is a bit more confused, because he is clearly profiteering in his personal business, using his political position to leverage profits at his properties.   He's also hiding all financial information that might show prejudice in his political decisions that would enrich his private estate.   I don't think President Trump acted treasonously, he did, as he always has, acted in his own self interest without regard to his public responsibilities to all Americans (regardless of wealth).