The Republican Party didn't exist yet. Tyler was a long-time Democrat-Republican, but was nonetheless elected Vice President on the Whig ticket. During his period in office, he attempted to start a new party and for a brief time was officially not a member of any party.
He's a democrat
republican
Republican
He is a Democrat.
he is a democrat
He is a republican.
John Baldacci is a Democrat.
Democrat
democrat nothing else
The related link lists him as a democrat.
John McCain is republican!! John McCain is republican!!
Neither, a federalist. Which would be a republican in our time.