John Bolton says he will testify in Trump's impeachment trial if Senate subpoenas him

John Bolton, President Trump's former national security adviser, said Monday that he is "prepared to testify" in a Senate impeachment trial – if he's subpoenaed by the GOP-controlled chamber. In November, Bolton defied a request from Democrats leading the House impeachment inquiry to testify. At the time, Bolton's lawyer told lawmakers he would take the impeachment committee to court if it subpoenaed him. According to Fiona Hill, one of Bolton's former deputies, Bolton was alarmed by the Ukraine pressure campaign, and the role of Rudy Giuliani, Trump's personal lawyer, in carrying out that shadow foreign policy agenda. Hill said Bolton called Giuliani a "hand grenade" and referred to the Ukraine effort as a "drug deal" that would backfire on the White House.