https://www.youtube.com/watch?v=-Q9_VHyE2KE
Video of the whole speech. ...
!
The context of the comment - before and after - is from about 36:10 to 38:10. Trump was speaking about how, mixed in with lots of more ordinary people, some countries have mixed criminals and people from mental institutions into the flood of illegals. Trump used Hannibal Lector, sarcastically, as an illustration of the sort of wonderful people being sent from mental institutions to the US for us to deal with.
This isn't exactly a new theme for Trump, nor a new thing for the MSM to pretzellate and lie about Trump's comments about illegals. Back in 2015 or 2016 Trump was called a racist and anti-immigrant for pointing out the obvious fact that
some illegals are violent criminals.