It doesn’t appear that President Trump was ever a Democrat st heart. And another thing for sure, he’ll never be a Democrat again!
Trump was (and is) a Democrat at heart.
But he is not a communist, and communists is what the Democrat Party are now. Truman was from the traditional wing of The Democrat Party, bringing in voters who wouldn't support Roosevelt.
During the cold war we didn't fight “The Russians.” We fought global socialism, a term which was used interchangeably with communism.
Some of the global socialists were Soviet, Some were Chinese, Some were Cuban, Some were Korean, Some were Brazilian, or perhaps east German some were Vietnamese or Nicaraguan, or little groups in the Philippines.
Wherever they were they used the same template, followed the same ideology, and eventually massacred civilians. Globalism and Socialism in concert always goes there. Aleksandr Solzhenitsyn explained why.
The Democrats have purged the party of its rational elements. How thoroughly they have done so became clear at Trump's Chicago rally.