There is no blackmail required with Linda for him to play for Team China. Trillions of dollars are to be made by GOP donors on globalist trade deals like the one POTUS sunk: TPP. So Grahamd does there bidding.
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The Republican Senate called (subpoenaed) Don Trump, Jr.
For over 30 hours of questioning, under oath.
But, the same Republican Senate refused to call Brother James or Hunter.