Days after voters rejected his vision for the country in the midterms, former President Donald J. Trump is expected to announce a third run for president.Despite the poor results for candidates he backed, why are Republican leaders powerless to stop him?Guest: Maggie Haberman, a White House correspondent for The New York Times.Background reading: 

• Republicans may still win the House. But an underwhelming showing has the party wrestling with what went wrong: Was it bad candidates, a bad message or Mr. Trump?
• Mr. Trump has faced unusual public attacks from across the Republican Party.
• Republicans pushing to move past the former president face one big obstacle: His voters.

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