Former National Security Advisor John Bolton is refusing to cooperate with Adam Schiff’s impeachment farce, and will not testify in front of the House Intelligence Committee, The Hill is reporting.

Here’s more via Reuters:

“Democratic lawmakers have summoned several little-known U.S. officials to testify this week in their impeachment inquiry of President Donald Trump but have their eye on a more prominent player – former national security adviser John Bolton.

The House of Representatives Democrats running the inquiry want to hear first-hand from the mustachioed foreign-policy hawk who, according to the testimony of other officials, was alarmed by a White House effort to pressure the president of Ukraine to investigate Trump’s political rivals.

Investigators in the impeachment inquiry want to talk today to Charles Kupperman, top aide to then-National Security Adviser John Bolton. But it’s unclear whether the former White House official will show up.https://t.co/s3T86l8uyG — NPR (@NPR) October 28, 2019

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“Obviously he has very relevant information and we want him to testify,” House Intelligence Committee Chairman Adam Schiff, one of the Democrats leading the effort, told ABC’s “This Week” on Sunday, referring to Bolton.

That may not be easy. White House officials have tried, with some success, to block current and former government officials from testifying in the inquiry. Secretary of State Mike Pompeo, acting White House Chief of Staff Mick Mulvaney and Trump’s personal lawyer, Rudy Giuliani, are among those who have defied House subpoenas for documents, although other witnesses have appeared before the committee despite orders from the administration to steer clear.

The White House says the probe is illegitimate because the House did not hold a formal vote in order to start it. A federal court said on Friday that no vote was needed.

JUST IN: Pointing to yesterday’s ruling declaring their impeachment inquiry valid, House investigation leaders demand that KUPPERMAN (Bolton’s deputy) honor their subpoena. pic.twitter.com/TbyknUHU4P — Kyle Cheney (@kyledcheney) October 26, 2019

Congressional sources told Reuters last week that they may call Bolton to testify in public hearings that are expected to start in the coming weeks. On Sunday, Schiff said he anticipated the White House would try to bar the former aide from appearing, but did not say whether he would he planned to call Bolton to testify in public or behind closed doors.

Amid the legal roadblocks thrown up by the White House, Monday’s scheduled witness, former deputy national security adviser Charles Kupperman, could fail to show up. Kupperman’s lawyer says lawmakers should wait for a court to rule whether he should comply with a congressional subpoena or honor the Trump administration’s order not to testify.”

Reuters contributed to this report.