I doubt this is true, but I can see a fair number of Bernie supporters not voting this year. So, in a sense, they would be voting for Trump. Only snag is most of the Bernie supporters have an equally strong dislike of Trump. And if the DEM party convinces them that the negative impact to their lives because of COVID-19 was mostly Trump’s fault, they may not abandon the party.
I suspect that most of the Bernie hardcore voters will just sit this election out rather than vote for President Trump. This might be a better option than having them vote. Even if they vote for President Trump, they are likely to vote Democrat/progressive down the ballot. I want my cake (President Trump re-elected) and eat it too (both houses of Congress in Republican control).
Personally, I see President Trump attracting the highest percentage of Democrat cross-overs since Reagan's 1984 election.
Except that 12% of Bernie supporters voted for President Trump in 2016