Well, he did bring a lot of blue collar workers to vote GOP in 2016, but we'll have to see if that holds. That was largely due to his promises of bringing more and better and better-paying jobs back to the U.S. through various means (restricting immigration, imposing tariffs, etc.) ... but I don't think he's made good on much of that, and so he might lose these voters pretty quickly in 2020. It takes more than a single election cycle to transform a party. BOTH parties are beholden to big business and to international Jєωry, but the Democrats try to create the PERCEPTION of being the people's party.
In point of fact, the GOP tend to be more in bed with the upper 1%, while the Democrats tend to be in bed with lower-class issues, whereas the Middle class swings both ways, depending on whether they identify more with the upper- or the lower- classes, and they can swing from election to election.
Had Trump made good on his 2016 campaign promises, he could have solidified that, but he has failed.