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Story summary
- U.S. Vice President JD Vance prepares for talks in Islamabad with Iran amid reports that U.S. President Donald Trump favored other negotiators.
- Trump has said he will take credit for any success while blaming Vance for failures.
- The initial talks ended without a deal.
- Vance's approval ratings are among the lowest for a vice president.
- Calls for invoking the 25th Amendment have emerged from Democrats and some within Trump's base.
