Ok, I worked through this example and watched what I did, and my process macroexpands to the following:
> Congress plans to
This is misleading so we need to take it out (https://news.ycombinator.com/newsguidelines.html).
> expand Patriot Act with DOJ access to your web browsing and search activity without a warrant
This sounds accurate once it's clear that it's a proposed amendment, but needs shortening. How could we shorten it? Well, "without a warrant" can turn into "warrantless". "DOJ" can probably be dropped, since whether it's DOJ or some other government branch isn't of top-level importance. And "you" or "your" can almost always be dropped from titles; that's a linkbait trope anyhow (https://hn.algolia.com/?dateRange=all&page=0&prefix=false&qu...). Applying those edits I get:
> expand Patriot Act with warrantless access to web browsing and search activity
That's shorter but not short enough because we need to get the amendment bit in there. At this point I'd probably compress "web browsing and search activity" into a short phrase that covers both. "Web history" comes to mind. Edit: on second thought, we can just keep the title's original word, "activity"—it's always best not to introduce new words if the existing ones will do:
> expand Patriot Act with warrantless access to web activity
Now we have 22 chars before the 80 limit. We can do this:
> Amendment to expand Patriot Act with warrantless access to web activity
Can we do this?
> Proposed amendment to expand Patriot Act with warrantless access to web activity
Yes we can! 80 chars on the nose. So I'd probably go with that and then wait for users to tell me how I got it wrong.
Edit: changed the title. Submitted title was "Congress to expand Patriot Act access to browsing/search history without warrant".