Republican leaders were twice forced to postpone final voting, first until Friday and then punting it to next week, as negotiators made a last-ditch push for support.
They were trying to persuade colleagues to seize the moment and tackle immigration problems by approving the bill, which includes $25 billion for Trump's border wall and a path to citizenship for young immigrants who have lived in the U.S. illegally since childhood.
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The House Republican immigration overhaul is dangling precariously. It is imperiled by stubborn differences between conservative and moderate factions - and by President Donald Trump's running commentary about a bill he only half-heartedly supported and then suggested would never become law.