Here's a fact: Democrats agreed to fund the TSA. Republicans were amenable. Trump said no.
“It would have worked ,” Mr. Kennedy said. “We could have had T.S.A. paid by the end of the week, but the president said ‘no deal.’”
https://www.nytimes.com/2026/03/23/us/politics/trump-shutdow...
There is no ambiguity here: Republicans are blocking TSA funding unless a bunch of unrelated stuff is also funded.