What could trigger a Fed rate hike?

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ISHARES 20+ YEAR TREASURY BOND ETF (NASDAQ: TLT) Delayed: 80.14 +0.01 (0.01%)
Previous Close $80.13    52 Week High $143.62 
Open $80.32    52 Week Low $118.66 
Day High $80.47    P/E N/A 
Day Low $80.14    EPS $0.00 
Volume 7,193,887