John Bolton will give evidence in closed-door impeachment hearing next week as Democrats look for Donald Trump's spurned national security adviser to burn him

• John Bolton will testify in closed-door impeachment inquiry next Thursday
• It's unclear if he's coming voluntarily or will be subpoenaed
• It's also unclear if he will show as White House may cite executive privilege 
• He has topped Democrats' wish list for witnesses
• Democrats will push him to burn President Trump
• Bolton was reported to be frustrated with efforts by Trump's personal attorney Rudy Giuliani to run a shadow foreign policy with the Ukraine
• He is in a strong position to answer questions about any quid pro quos 

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