Right. Borrow $5 trillion for infrastructure and pay <$50 billion / year. That's a positive ROI for sure. Only issue is you would flood the markets and raise those rates, so you wouldn't get all of it, but still a lot. I have always though that the government should act strategically and take advantage of low rates like other market participants.
This administration has a single minded project that has been a struggle to get financed. It would be a huge coup for them to use this downturn to get it financed without borrowing from Peter to pay Paul. Then again, this is all probably just fake news.