What could trigger a Fed rate hike?

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ISHARES 20+ YEAR TREASURY BOND ETF (NASDAQ: TLT) Delayed: 83.17 +0.04 (0.05%)
Previous Close $83.13    52 Week High $143.62 
Open $83.04    52 Week Low $118.66 
Day High $83.42    P/E N/A 
Day Low $83.00    EPS $0.00 
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