Had he done so, you can bet your bippy that Trump would have remained in charge of Jeff Roe, and not the other way around, as it appears Cruz has been doing, submitting to Roe's down-and-dirty tactics and then denying them. Early on, Trump split with his longtime friend and advisor Roger Stone due to not wanting to run a dirty trickster campaign.
This is the first I’ve heard of Trump trying to hire Roe. I hope Optiguy comes through with a link.