The move came just days before Stone was to begin serving a 40-month prison sentence for lying to the US Congress, witness-tampering and obstructing the House investigation into whether Trump's campaign colluded with Russia to win the 2016 election.
Former US national security adviser John Bolton in his book has accused President Trump of seeking help from China for a win in 2020 presidential elections. The White House asked a federal court for a restraining order against its release.
The Democratic-led House impeached Trump on Dec 18 on charges of abuse of power for asking Ukraine to investigate political rival Joe Biden and obstruction of Congress for blocking testimony and documents sought by lawmakers in their investigation.
The impeachment trial of US President Donald Trump is approaching a climactic vote that could determine whether senators will hear from witnesses like former national security adviser John Bolton.
Democrats are seeking to have the Senate subpoena former adviser John Bolton to testify against President Trump, but Republicans threatened to demand that presidential hopeful Joe Biden and his son, Hunter, also testify.
“They're here to perpetrate the most massive interference in an election in American history," White House counsel Pat Cipollone told senators. “And we can't allow that to happen."
Lawyers representing President Trump got their first chance on Saturday to discredit the impeachment case made this week by Democrats.
Democrats calls for witnesses in the Trump impeachment trial to explore Ukraine corruption allegations, but are met with unmoving bipartisan resistance.
Little to no signs were seen that Democrat arguments had changed any minds among Republican senators who control the chamber.
Adam Schiff, head of the House of Representatives' prosecution team, described how US President Trump solicited foreign interference in domestic elections.
US President Trump lashes out at his accusers in the Senate, says he wouldn't attend any of the impeachment trial, but adds, "I'd sort of love to sit right there front row, and stare at their corrupt faces."
Trial of Donald Trump kicks off as lawmakers take solemn oath to be "impartial" in deciding whether to force 45th US president from office.
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