WASHINGTON, Nov 12 — Acting White House Chief of Staff Mick Mulvaney yesterday withdrew his request to join a lawsuit seeking a court ruling on whether witnesses must testify in the US House of Representatives impeachment inquiry into President Donald Trump, saying he would instead file his own case, according to a court document.

Mulvaney had earlier sought to participate in a lawsuit filed by Charles Kupperman, a former deputy to ousted national security adviser John Bolton, seeking a court ruling on whether he should comply with a congressional subpoena or honor the Trump administration’s order not to testify.

Mulvaney withdrew that request following a conference call held by the judge assigned to Kupperman's lawsuit.

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Mulvaney said in a one-page court filing that he intended to “refile” his claims “in the matter discussed on this evening's telephonic conference, as a separate related case.”

Last week, House Democrats withdrew their subpoena to Kupperman, saying they did not want to delay the impeachment investigation, and asked a judge to dismiss the litigation as moot. — Reuters