Below, see a liberal take and a conservative take on the idea of bias within major web sites. Seems to me that Google is the least likely to actually have intentional built-in algorithm bias (which doesn't imply that I don't think their management is quite leftist.) Seems that Trump based his claim on one mediocre bit of "analysis" on a conservative web site.
But even though this is probably "fake news" that doesn't mean that Trump's base won't believe that Google search results are biased just like CNN's reporting is. The question is whether Trump's base can do anything to make Google care, or whether Google will be afraid enough of Congress to do anything...and then just what would they do if there isn't actual bias built into the algorithm?
If I were Google, I'd just wait for Dems to take the House in November...and then panic if they don't.
Liberal angle on this: