Mike Johnson, the leader of our lower legislative house, is blocking all votes on Ukraine aid. He won’t allow it to come to a vote. So, as a way to pressure him, it has been linked to something he ostensibly supports so that he has a harder time unilaterally blocking it.
He can still probably block it, but its harder to justify to his voters.
Ukraine aid on its own is a flat no, though, for as long as he occupies his position, which he got fairly recently.