Trump’s win in 2016 wasn’t because he secured more votes, but because of the electoral college. It was still shocking that the man who used the “grab ‘em by the p*ssy” statement managed to become the POTUS.
However, after becoming the President, ruining the economy, openly supporting racism, tweeting like a lunatic all the while, etc his own supporters and fellow Republicans leaders have started speaking against him. It is highly unlikely that he would win against any candidate in the 2020 elections, especially Hillary.
When Fox's Laura Ingraham asked Trump who he would like as opponent for the 2020 elections he replied "So far I like them all."
Laura made her question more specific and asked if his opinion on Hillary as a contender, Trump replied "I like her too, I’d be very happy with Hillary."
While I would like Trump to be kicked out of the office, it would be lovely if (or rather when) Hillary replaces him as the POTUS.