Fiona Hill, in testimony before the House Intelligence Committee, directly contradicted Trump, who only occasionally has said it was possible Russia intervened in the election, while saying he accepts Russian President Vladimir Putin's denial that Moscow interfered to support him.
Investigators allege that Westpac allowed institutions from countries including Iraq, Lebanon, Zimbabwe and the Democratic Republic of Congo access into Australia’s financial sector without proper checks.
Stone was indicted in January as part of special counsel Robert Mueller's investigation into Russian election tampering. Prosecutors alleged he lied to lawmakers about WikiLeaks, tampered with witnesses and obstructed a House intelligence committee probe.
At the urging of Trump, Republican lawmakers mounted a vigorous defense of the president's actions in dealing with Ukraine over several months, and they asserted that the Democrats' case for impeachment against Trump was nonexistent.