Donald Trump did make the statement praising El Salvador's prison system as a 'massive' and 'brilliant' system where people 'don't get out,' in the context of a deal to send detained migrants and criminals there.
Trump on El Salvador: "They've built a massive prison system. It's a hell of a system. We bring people there, and when they go there, they don't get out ... it's a brilliant system."

FactVerify
Source: factverify.com
What the Evidence Shows
The claim quotes Donald Trump saying, "They've built a massive prison system. It's a hell of a system. We bring people there, and when they go there, they don't get out.
It's a brilliant system. " Multiple sources confirm that Trump made this statement regarding El Salvador's prison system. According to reports from The Express and AP News, Trump praised the country's mega-prison system during discussions about a deal between the U.S. And El Salvador to send detained migrants and imprisoned criminals to this facility.
The prison is described as a large, strict facility with limited visitation and recreation, part of El Salvador's aggressive anti-crime strategy. Trump's quote reflects his approval of the system's effectiveness in detaining individuals without release. There is no indication that the quote is fabricated or taken out of context; rather, it aligns with the known cooperation between the Trump administration and El Salvador on immigration enforcement.
Therefore, the claim accurately represents Trump's statement on El Salvador's prison system.