There are a lot of people who will happily accept a temporary suspension of immigration from countries full of ISIS fighters who are trying to exploit our immigration system based on the president's word that the various security services need 90 days to tighten things up. There are a lot of people in this group who also will go out and protest if literally anything more aggressive is done from here (and who also vehemently opposed the original proposal during the campaign.)
> There are a lot of people in this group who also will go out and protest
Trump, of all people, has given no indication at all that his policy decisions will be swayed by protest.
> The slippery slope fallacy falls short.
It's not a slippery slope when Trump said that a Muslim ban was what he was going to do! It's not "oh, he might bring up banning all Muslims from entering at this rate". He already said he wanted to do that. Explicitly.
The slippery slope fallacy falls short.