Republican political operative Roger Stone was convicted in November of a seven-count indictment that accused him of lying to Congress.
Republican senators are trying to figure out a way to deal with the fallout from John Bolton's forthcoming book, which provides a potential eyewitness account of US President Trump's actions at the heart of the impeachment charges.
House Speaker Nancy Pelosi signs two articles of impeachment against President Trump before they are delivered to Senate, where Trump faces trial on charges of abuse of power and obstruction of Congress.
Passage of charges against Trump in Democratic-led House, now seen as all but certain, would lead to a trial in Senate on whether to remove Trump from office. The Republicans who control the Senate have shown little sign of supporting his removal.
Marie Yovanovitch testifies in the second public hearing even as US president launches Twitter attack on her during the testimony, dubbed "witness intimidation" by Democrats.
Democrats managed to secure the vote that defines the rules for the impeachment probe of President Trump with a 232-196 vote, which had two Democrats and all Republicans voting against the package.
Trump is accused of withholding military aid to compel Ukraine to mount a corruption probe against his Democratic election rival Joe Biden - effectively using US foreign policy in an illegal shakedown for his personal political benefit.
A federal judge gave the Justice Department until next Wednesday to provide the blacked out material from the Robert Mueller report that was subpoenaed by the House Judiciary Committee.
US President Donald Trump reportedly urged the new leader of Ukraine this summer to investigate the son of former Vice President Joe Biden.
Offering little in the way of new information, Mueller instead urged House representatives to read the heavily redacted report, to the disappointment of many.
Robert Mueller faced questions on his 448-page report detailing contacts between US President Donald Trump's 2016 campaign and Russia at a time when Moscow was interfering in the election with hacking, and obstruction of justice.
The House Judiciary Committee voted to authorise subpoenas for 12 people mentioned in special counsel Robert Mueller's report, including President Donald Trump's son-in-law, Jared Kushner, and former Attorney General Jeff Sessions.
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